Include network disconnect info in troubleshooting docs (elastic#112323)

A misplaced `//end::` tag meant that the docs added in elastic#112271 are only
included in the page on fault detection and not the equivalent
troubleshooting docs. This commit fixes the problem.

docs/reference/modules/discovery/fault-detection.asciidoc

@@ -300,7 +300,6 @@ To reconstruct the output, base64-decode the data and decompress it using
 ----
 cat shardlock.log | sed -e 's/.*://' | base64 --decode | gzip --decompress
 ----
-//end::troubleshooting[]
 
 [discrete]
 ===== Diagnosing other network disconnections
@@ -345,3 +344,4 @@ packet capture simultaneously from the nodes at both ends of an unstable
 connection and analyse it alongside the {es} logs from those nodes to determine
 if traffic between the nodes is being disrupted by another device on the
 network.
+//end::troubleshooting[]