Docs: Fixed and remove broken links to HMC books

Details:

* Removed entries in the Bibliography for WS-API book versions 2.11/2.12,
  since they no longer seem to be publicly available.

* Fixed broken links to the WS-API book versions >=2.13, since IBM changed
  the links. The links for versions 2.13/2.14 use an older (but working)
  link that will alsso be migrated to the new module-based links.

* Removed entries in the Bibliography for what was called "HMC Operations
  Guide", and removed the (one) reference to it. This book no longer exists
  and has been replaced with a PDF version of the HMC Help System. Since
  it is too cumbersome to link to specific chapters in a PDF, the
  reference to it in the introduction section of the docs has been removed,
  and it was not really necessary anyway.

Signed-off-by: Andreas Maier <maiera@de.ibm.com>

docs/appendix.rst

@@ -620,60 +620,27 @@ Bibliography
    HMC API
        The Web Services API of the z Systems Hardware Management Console, described in the following books:
 
-   HMC API 2.11.1
-       `IBM SC27-2616, System z Hardware Management Console Web Services API (Version 2.11.1) <https://www.ibm.com/support/pages/node/6017542>`_
-
-   HMC API 2.12.0
-       `IBM SC27-2617, System z Hardware Management Console Web Services API (Version 2.12.0) <https://www.ibm.com/support/pages/node/6019030>`_
-
-   HMC API 2.12.1
-       `IBM SC27-2626, System z Hardware Management Console Web Services API (Version 2.12.1) <https://www.ibm.com/support/pages/node/6017614>`_
-
    HMC API 2.13.0
-       `IBM SC27-2627, z Systems Hardware Management Console Web Services API (Version 2.13.0) <https://www.ibm.com/support/pages/node/6018628>`_
+       `IBM SC27-2627-00a, z Systems Hardware Management Console Web Services API (Version 2.13.0) <https://www.ibm.com/docs/en/module_1707928542006/pdf/SC27-2627-00a.pdf>`_
 
    HMC API 2.13.1
-       `IBM SC27-2634, z Systems Hardware Management Console Web Services API (Version 2.13.1) <https://www.ibm.com/support/pages/node/6019732>`_
+       `IBM SC27-2634-03a, z Systems Hardware Management Console Web Services API (Version 2.13.1) <https://www.ibm.com/docs/en/module_1707928542006/pdf/SC27-2634-03a.pdf>`_
 
    HMC API 2.14.0
-       `IBM SC27-2636, IBM Z Hardware Management Console Web Services API (Version 2.14.0) <https://www.ibm.com/support/pages/node/6020008>`_
+       `IBM SC27-2636-04a, IBM Z Hardware Management Console Web Services API (Version 2.14.0) <https://www.ibm.com/docs/en/module_1687361734185/pdf/SC27-2636-04a.pdf>`_
 
    HMC API 2.14.1
-       `IBM SC27-2637, IBM Z Hardware Management Console Web Services API (Version 2.14.1) <https://www.ibm.com/support/pages/node/6019768>`_
+       `IBM SC27-2637-01a, IBM Z Hardware Management Console Web Services API (Version 2.14.1) <https://www.ibm.com/docs/en/module_1687361734185/pdf/SC27-2637-01a.pdf>`_
 
    HMC API 2.15.0
-       `IBM SC27-2638, IBM Z Hardware Management Console Web Services API (Version 2.15.0) <https://www.ibm.com/support/pages/node/6019720>`_
+       `IBM SC27-2638-04c, IBM Z Hardware Management Console Web Services API (Version 2.15.0) <https://www.ibm.com/docs/en/module_1687296212988/pdf/SC27-2638-04c.pdf>`_
        (covers both GA1 and GA2)
 
    HMC API 2.16.0
-       `IBM SC27-2642, IBM Z Hardware Management Console Web Services API (Version 2.16.0) <https://www.ibm.com/support/pages/node/6591083>`_
-       (covers both GA1 and GA2)
-
-   HMC Operations Guide
-       The operations guide of the z Systems Hardware Management Console, in the following books (subset):
-
-   HMC Operations Guide 2.11.1
-       `IBM SC28-6905, System z Hardware Management Console Operations Guide (Version 2.11.1) <https://www.ibm.com/support/pages/node/6019948>`_
-
-   HMC Operations Guide 2.12.1
-       `System z Hardware Management Console Operations Guide (Version 2.12.1) <https://www.ibm.com/support/pages/node/6017692>`_
-
-   HMC Operations Guide 2.13.1
-       `z Systems Hardware Management Console Operations Guide (Version 2.13.1) <https://www.ibm.com/support/pages/node/6016846>`_
-
-   HMC Operations Guide 2.14.1
-       `Hardware Management Console Operations Guide (Version 2.14.1) <https://www.ibm.com/support/pages/node/6019132>`_
-
-   HMC Operations Guide 2.15.0
-       `Hardware Management Console Operations Guide (Version 2.15.0) <https://www.ibm.com/support/pages/node/6018724>`_
-       (covers both GA1 and GA2)
-
-   HMC Operations Guide 2.16.0
-       `Hardware Management Console Operations Guide (Version 2.16.0) <https://www.ibm.com/support/pages/node/6619013>`_
-       (covers both GA1 and GA2)
+       `IBM SC27-2642-02, IBM Z Hardware Management Console Web Services API (Version 2.16.0) <https://www.ibm.com/docs/en/module_1675371155154/pdf/SC27-2642-02.pdf>`_
 
    HMC Security
-       `Hardware Management Console Security <https://www.ibm.com/support/pages/node/6017320>`_
+       `IBM SC28-6987-01, Hardware Management Console Security <https://www.ibm.com/docs/en/module_1687361734185/pdf/SC28-6987-01.pdf>`_
 
 
 .. _`Related projects`:

docs/changes.rst

@@ -41,6 +41,11 @@ Released: not yet
 
 * Dev: Fixed new issue 'possibly-used-before-assignment' in Pylint 3.2.0.
 
+* Docs: Fixed broken links to HMC books since IBM changed the links. As part
+  of that, removed Bibliography entries for the HMC API book versions 2.11/2.12,
+  and for all versions of the HMC Operations Guide (which changed to become the
+  HMC Help System PDFs). (issue #1459)
+
 **Enhancements:**
 
 **Cleanup:**

docs/intro.rst

@@ -420,8 +420,6 @@ accordingly:
 
    * LPARs to be accessed
 
-For details, see the :term:`HMC Operations Guide`.
-
 
 .. _`Setting up firewalls or proxies`: