config: rename "gc.pruneWorktreesExpire" to "gc.worktreePruneExpire"

As of df0b6cf (worktree: new place for "git prune --worktrees",
2015-06-29), linked worktree pruning functionality moved from
"git prune --worktrees" to "git worktree prune". Rename the
associated configuration variable accordingly.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -1229,8 +1229,7 @@ gc.pruneexpire::
 	"now" may be used to disable this  grace period and always prune
 	unreachable objects immediately.
 
-gc.pruneworktreesexpire::
-	When 'git gc' is run, it will call
+gc.worktreePruneExpire::
 	When 'git gc' is run, it calls
 	'git worktree prune --expire 3.months.ago'.
 	This config variable can be used to set a different grace

Documentation/git-worktree.txt

@@ -27,7 +27,7 @@ bare repository) and zero or more linked working trees.
 When you are done with a linked working tree you can simply delete it.
 The working tree's administrative files in the repository (see
 "DETAILS" below) will eventually be removed automatically (see
-`gc.pruneworktreesexpire` in linkgit::git-config[1]), or you can run
+`gc.worktreePruneExpire` in linkgit::git-config[1]), or you can run
 `git worktree prune` in the main or any linked working tree to
 clean up any stale administrative files.
 

builtin/gc.c

@@ -85,7 +85,7 @@ static void gc_config(void)
 	git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit);
 	git_config_get_bool("gc.autodetach", &detach_auto);
 	git_config_date_string("gc.pruneexpire", &prune_expire);
-	git_config_date_string("gc.pruneworktreesexpire", &prune_worktrees_expire);
+	git_config_date_string("gc.worktreepruneexpire", &prune_worktrees_expire);
 	git_config(git_default_config, NULL);
 }