Correct comment wording in extension.c

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'.