docs: fix typo in worktree.adoc 'extension'

From: Mikhail Malinouski <[email protected]>

The documentation incorrectly referred to the extension without an 's'. This fixes the typo for clarity.

---
docs: should be 's' on the end of the "extension" in the docs. (recreation of broken 1936 PR)

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1967%2FM-L-Ml%2Fpatch-1-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1967/M-L-Ml/patch-1-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1967

 Documentation/config/worktree.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 5e35c7d018..9e3f84f748 100644
@@ -15,5 +15,5 @@ worktree.useRelativePaths::
 	different locations or environments. Defaults to "false".
 +
 Note that setting `worktree.useRelativePaths` to "true" implies enabling the
-`extension.relativeWorktrees` config (see linkgit:git-config[1]),
+`extensions.relativeWorktrees` config (see linkgit:git-config[1]),
 thus making it incompatible with older versions of Git.

base-commit: cb3b40381e1d5ee32dde96521ad7cfd68eb308a6

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