PEP 8: Fix typos (#2600)

pep-0008.txt

@@ -296,7 +296,7 @@ related one-liners (e.g. a set of dummy implementations).
 Use blank lines in functions, sparingly, to indicate logical sections.
 
 Python accepts the control-L (i.e. ^L) form feed character as
-whitespace; Many tools treat these characters as page separators, so
+whitespace; many tools treat these characters as page separators, so
 you may use them to separate pages of related sections of your file.
 Note, some editors and web-based code viewers may not recognize
 control-L as a form feed and will show another glyph in its place.
@@ -1359,7 +1359,7 @@ Function Annotations
 With the acceptance of :pep:`484`, the style rules for function
 annotations have changed.
 
-- Function annotations should use :pep:`484` syntax (There are some
+- Function annotations should use :pep:`484` syntax (there are some
   formatting recommendations for annotations in the previous section).
 
 - The experimentation with annotation styles that was recommended