Fixed minor typos (#28489)

docs/README.md

@@ -250,7 +250,7 @@ then its documentation should look like this:
 
 Note that we always omit the "defaults to \`None\`" when None is the default for any argument. Also note that even
 if the first line describing your argument type and its default gets long, you can't break it on several lines. You can
-however write as many lines as you want in the indented description (see the example above with `input_ids`).
+however, write as many lines as you want in the indented description (see the example above with `input_ids`).
 
 #### Writing a multi-line code block