Tweak the comment on RE2::QuoteMeta().

Change-Id: If1303cc74502f7d96e91e27af693cacd61421f12
Reviewed-on: https://code-review.googlesource.com/c/re2/+/52311
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/re2/re2.h b/re2/re2.h
index 956aeb1..46409cb 100644
--- a/re2/re2.h
+++ b/re2/re2.h
@@ -447,7 +447,7 @@
 
   // Escapes all potentially meaningful regexp characters in
   // 'unquoted'.  The returned string, used as a regular expression,
-  // will exactly match the original string.  For example,
+  // will match exactly the original string.  For example,
   //           1.5-2.0?
   // may become:
   //           1\.5\-2\.0\?