Fix wording in docstrings

IPython/core/completer.py

@@ -185,11 +185,11 b" def provisionalcompleter(action='ignore'):"
     """
 
 
-    This contest manager has to be used in any place where unstable completer
+    This context manager has to be used in any place where unstable completer
     behavior and API may be called.
 
     >>> with provisionalcompleter():
-    ...     completer.do_experimetal_things() # works
+    ...     completer.do_experimental_things() # works
 
     >>> completer.do_experimental_things() # raises.
 
@@ -198,11 +198,10 b" def provisionalcompleter(action='ignore'):"
         By using this context manager you agree that the API in use may change
         without warning, and that you won't complain if they do so.
 
-        You also understand that if the API is not to you liking you should report
-        a bug to explain your use case upstream and improve the API and will loose
-        credibility if you complain after the API is make stable.
+        You also understand that, if the API is not to your liking, you should report
+        a bug to explain your use case upstream.
 
-        We'll be happy to get your feedback , feature request and improvement on
+        We'll be happy to get your feedback, feature requests, and improvements on
         any of the unstable APIs !
     """
     with warnings.catch_warnings():
@@ -1138,7 +1137,7 b' class IPCompleter(Completer):'
 
     def all_completions(self, text) -> List[str]:
         """
-        Wrapper around the completions method for the benefit of emacs.
+        Wrapper around the completion methods for the benefit of emacs.
         """
         prefix = text[:text.rfind(".") + 1]
         with provisionalcompleter():