[docs][llvm-ar] Fix option:: O after r375106
docs-llvm-html fails => unknown option: O
There are lots of formatting issues in the file but they will be fixed by D68998.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375107 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/llvm-ar.rst b/docs/CommandGuide/llvm-ar.rst
index a138dcf..8a36a40 100644
--- a/docs/CommandGuide/llvm-ar.rst
+++ b/docs/CommandGuide/llvm-ar.rst
@@ -145,7 +145,7 @@
When extracting files, this option will cause **llvm-ar** to preserve the
original modification times of the files it writes.
-[O]
+.. option:: O
Display member offsets inside the archive.
