BUG: Correct functionality of numpydoc SS05.

Currently SS05 checks for infinitive verbs by checking if the last character is "s". However, if the first word is "process", which is valid, this incorrectly throws a numpydoc validation error.

This commit allows the first word to end in two "s"es without flagging as an error. This will allow for words like "process" or "progress," while still checking for invalid words like "creates."

Author: maxinelasp

numpydoc/validate.py

@@ -711,7 +711,12 @@ def validate(obj_name, validator_cls=None, **validator_kwargs):
             errs.append(error("SS03"))
         if doc.summary != doc.summary.lstrip():
             errs.append(error("SS04"))
-        elif doc.is_function_or_method and doc.summary.split(" ")[0][-1] == "s":
+        # Heuristic to check for infinitive verbs - shouldn't end in "s"
+        elif (
+            doc.is_function_or_method
+            and doc.summary.split(" ")[0][-1] == "s"
+            and doc.summary.split(" ")[0][-2] != "s"
+        ):
             errs.append(error("SS05"))
         if doc.num_summary_lines > 1:
             errs.append(error("SS06"))