doc: add missing git footers

Almost every page has a footer that links back to the main
git(1) page. Let's add it on the few that are missing it.

Documentation/git-fsck-objects.txt

@@ -15,3 +15,7 @@ DESCRIPTION
 
 This is a synonym for linkgit:git-fsck[1].  Please refer to the
 documentation of that command.
+
+GIT
+---
+Part of the linkgit:git[1] suite

Documentation/git-init-db.txt

@@ -16,3 +16,7 @@ DESCRIPTION
 
 This is a synonym for linkgit:git-init[1].  Please refer to the
 documentation of that command.
+
+GIT
+---
+Part of the linkgit:git[1] suite

Documentation/git-repo-config.txt

@@ -16,3 +16,7 @@ DESCRIPTION
 
 This is a synonym for linkgit:git-config[1].  Please refer to the
 documentation of that command.
+
+GIT
+---
+Part of the linkgit:git[1] suite

Documentation/git-stage.txt

@@ -17,3 +17,7 @@ DESCRIPTION
 
 This is a synonym for linkgit:git-add[1].  Please refer to the
 documentation of that command.
+
+GIT
+---
+Part of the linkgit:git[1] suite

Documentation/git-svn.txt

@@ -877,3 +877,7 @@ reset) branches-maxRev and/or tags-maxRev as appropriate.
 SEE ALSO
 --------
 linkgit:git-rebase[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite