Add missing closing </a>.

Author: llasram

README.md

@@ -165,7 +165,7 @@ when there are no arguments on the same line as the function name.
   [x] (bar x))
  ```
 
-* <a name="docstring-after-fn-name">
+* <a name="docstring-after-fn-name"></a>
  When adding a docstring – especially to a function using the above form – take
  care to correctly place the docstring after the function name, not after the
  argument vector. The latter is not invalid syntax and won’t cause an error,