code: protected void makeMethodDoc(MethodSymbol meth, TreePath treePath) {
          MethodDocImpl result = (MethodDocImpl)methodMap.get(meth);
          if (result != null) {
              if (treePath != null) result.setTreePath(treePath);
          } else {
              result = new MethodDocImpl(this, meth, treePath);
              methodMap.put(meth, result);
          }
      }
docs: Create a MethodDoc for this MethodSymbol.
  Should be called only on symbols representing methods.