Apply suggestions from code review

Co-authored-by: Eric Larson <larson.eric.d@gmail.com>

Author: larsoner

mne/io/base.py

@@ -574,6 +574,8 @@ def load_data(self, *, memmap=None, verbose=None):
         memmap : path-like | None
             If not ``None``, preload data into a memory-mapped file at this
             path. If ``None`` (default), preload data into RAM.
+
+            .. versionadded:: 1.13
         %(verbose)s
 
         Returns