Fix a typo

README.md

@@ -18,7 +18,7 @@ Currently this contains the following documents:
 There is some Google-internal terminology used in some of these documents, which
 we clarify here for external readers:
 
-*   **CL**: Stands for "changelist," which means one self-contained change that
+*   **CL**: Stands for "changelist", which means one self-contained change that
     has been submitted to version control or which is undergoing code review.
     Other organizations often call this a "change" or a "patch."
 *   **LGTM**: Means "Looks Good to Me." It is what a code reviewer says when