[doc] Fix typos in cgi.rst (GH-24766) (GH-26131)

(cherry picked from commit 19d839a)

Co-authored-by: Géry Ogam <[email protected]>

Author: miss-islington

Doc/library/cgi.rst

@@ -316,7 +316,7 @@ algorithms implemented in this module in other circumstances.
 .. function:: test()
 
    Robust test CGI script, usable as main program. Writes minimal HTTP headers and
-   formats all information provided to the script in HTML form.
+   formats all information provided to the script in HTML format.
 
 
 .. function:: print_environ()
@@ -346,8 +346,8 @@ Caring about security
 
 .. index:: pair: CGI; security
 
-There's one important rule: if you invoke an external program (via the
-:func:`os.system` or :func:`os.popen` functions. or others with similar
+There's one important rule: if you invoke an external program (via
+:func:`os.system`, :func:`os.popen` or other functions with similar
 functionality), make very sure you don't pass arbitrary strings received from
 the client to the shell.  This is a well-known security hole whereby clever
 hackers anywhere on the Web can exploit a gullible CGI script to invoke
@@ -424,7 +424,7 @@ above on installing your CGI script carefully can save you a lot of time.  If
 you wonder whether you have understood the installation procedure correctly, try
 installing a copy of this module file (:file:`cgi.py`) as a CGI script.  When
 invoked as a script, the file will dump its environment and the contents of the
-form in HTML form. Give it the right mode etc, and send it a request.  If it's
+form in HTML format. Give it the right mode etc., and send it a request.  If it's
 installed in the standard :file:`cgi-bin` directory, it should be possible to
 send it a request by entering a URL into your browser of the form: