Fix small typo in docs for git_repository_message.
diff --git a/include/git2/repository.h b/include/git2/repository.h
index 7cc4a13..c810519 100644
--- a/include/git2/repository.h
+++ b/include/git2/repository.h
@@ -471,7 +471,7 @@ GIT_EXTERN(int) git_repository_index(git_index **out, git_repository *repo);
* @param out Buffer to write data into or NULL to just read required size
* @param len Length of `out` buffer in bytes
* @param repo Repository to read prepared message from
- * @return GIT_ENOUTFOUND if no message exists, other value < 0 for other
+ * @return GIT_ENOTFOUND if no message exists, other value < 0 for other
* errors, or total bytes in message (may be > `len`) on success
*/
GIT_EXTERN(int) git_repository_message(char *out, size_t len, git_repository *repo);