Fix typo

Author: gvalkov

pip/req/req_file.py

@@ -54,8 +54,8 @@
 _req_parser.add_option(cmdoptions.global_options.make())
 _req_parser.disable_interspersed_args()
 
-# By default optparse sys.exits on error occurs. We want to wrap that
-# in our own exception.
+# By default optparse sys.exits on parsing errors. We want to wrap
+# that in our own exception.
 def parser_exit(self, msg):
     raise RequirementsFileParseError(msg)
 _req_parser.exit = parser_exit
@@ -188,7 +188,7 @@ def parse_content(filename, content, finder=None, comes_from=None, options=None,
 
 def parse_line(line):
     if not line.startswith('-'):
-        # Split the requirements from the options.
+        # Split the requirement from the options.
         if ' --' in line:
             req, opts = line.split(' --', 1)
             opts = parse_requirement_options('--%s' % opts)