Merge branch 'ds/commit-graph-fsck'

Finishing touches to doc.

* ds/commit-graph-fsck:
  config: fix commit-graph related config docs

Documentation/config.txt

@@ -927,12 +927,10 @@ core.notesRef::
 This setting defaults to "refs/notes/commits", and it can be overridden by
 the `GIT_NOTES_REF` environment variable.  See linkgit:git-notes[1].
 
-gc.commitGraph::
-	If true, then gc will rewrite the commit-graph file when
-	linkgit:git-gc[1] is run. When using linkgit:git-gc[1]
-	'--auto' the commit-graph will be updated if housekeeping is
-	required. Default is false. See linkgit:git-commit-graph[1]
-	for details.
+core.commitGraph::
+	If true, then git will read the commit-graph file (if it exists)
+	to parse the graph structure of commits. Defaults to false. See
+	linkgit:git-commit-graph[1] for more information.
 
 core.useReplaceRefs::
 	If set to `false`, behave as if the `--no-replace-objects`
@@ -1767,6 +1765,13 @@ this configuration variable is ignored, all packs except the base pack
 will be repacked. After this the number of packs should go below
 gc.autoPackLimit and gc.bigPackThreshold should be respected again.
 
+gc.writeCommitGraph::
+	If true, then gc will rewrite the commit-graph file when
+	linkgit:git-gc[1] is run. When using linkgit:git-gc[1]
+	'--auto' the commit-graph will be updated if housekeeping is
+	required. Default is false. See linkgit:git-commit-graph[1]
+	for details.
+
 gc.logExpiry::
 	If the file gc.log exists, then `git gc --auto` won't run
 	unless that file is more than 'gc.logExpiry' old.  Default is