Correct comment wording in extension.c

[albert tan]

Hi Hackers,
I think I've found a small issue.

When studying the following comment：
' The control file will be search on Extension_control_path paths if
  control->control_dir is NULL, otherwise it will use the value of
control_dir
  to read and parse the .control file, so it assume that the control_dir is
a
  valid path for the control file being parsed.' in the extension.c

I think there are some minor errors in this sentence.
I believe:
  'will be searched' is better than 'will be search'.
  'it assumes' is better than 'it assume'.

v1-0001-Modify-comments-words-in-extension.c.patch
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