DOC: Fix typos found by codespell (#514)

Author: DimitriPapadopoulos

doc/validation.rst

@@ -72,7 +72,7 @@ the pre-commit hook as follows:
 In addition to the above, :ref:`inline ignore comments <inline_ignore_comments>`
 can be used to ignore findings on a case by case basis.
 
-If any issues are found when commiting, a report is printed out, and the
+If any issues are found when committing, a report is printed out, and the
 commit is halted:
 
 .. code-block:: output

numpydoc/numpydoc.py

@@ -404,7 +404,7 @@ def match_items(lines, content_old):
     This function tries to match the lines in ``lines`` with the items (source
     file references and line numbers) in ``content_old``. The
     ``mangle_docstrings`` function changes the actual docstrings, but doesn't
-    keep track of where each line came from. The manging does many operations
+    keep track of where each line came from. The mangling does many operations
     on the original lines, which are hard to track afterwards.
 
     Many of the line changes come from deleting or inserting blank lines. This