changelog edits

Change-Id: I8acc5d84ca10f839727fb159d5283fe74763e7a6

Author: zzzeek

docs/build/unreleased/drop_py_38.rst

@@ -1,4 +1,5 @@
 .. change::
-    :tags: change, general
+    :tags: changed, general
 
-    Support for Python 3.8 is dropped as of Alembic 1.15.0.  Python 3.8 is EOL.
+    Support for Python 3.8 is dropped as of Alembic 1.15.0; this version is
+    now EOL so Python 3.9 or higher is required for Alembic 1.15.

docs/build/unreleased/drop_sqla_13.rst

@@ -1,5 +1,6 @@
 .. change::
-    :tags: change, general
+    :tags: changed, general
 
     Support for SQLAlchemy 1.3, which was EOL as of 2021, is now dropped from
-    Alembic as of version 1.15.0.
+    Alembic as of version 1.15.0.   SQLAlchemy version 1.4 or greater is
+    required for use with Alembic 1.15.0.

docs/build/unreleased/issue1597.rst

@@ -1,6 +1,7 @@
- .. change::
-        :tags: check, autogenerate
-        :tickets: 1597
+.. change::
+    :tags: usecase, autogenerate
+    :tickets: 1597
 
-        Add revision context to AutogenerateDiffsDetected so that command can be wrapped and diffs may be output in a different format.
-        Pull request courtesy of Louis-Amaury Chaib (@lachaib).
+    Add revision context to AutogenerateDiffsDetected so that command can be
+    wrapped and diffs may be output in a different format. Pull request
+    courtesy Louis-Amaury Chaib (@lachaib).