fix a few typos in KB

Author: Brent Cook

documentation/modules/exploit/linux/http/pineapple_bypass_cmdinject.md

@@ -1,9 +1,9 @@
 ## Background
 
 The 'pineapple_bypass_cmdinject' exploit attacks a weak check for
-pre-authorized files (CSS files) which allows the attacker to bypass logging in
-at all and then relies on the anti-CSRF vulnerability (CVE-2015-4624) to obtain
-command injection.
+pre-authorized CSS files, which allows the attacker to bypass
+authentication. The exploit then relies on the anti-CSRF vulnerability
+(CVE-2015-4624) to obtain command injection.
 
 This exploit uses a utility function in
 /components/system/configuration/functions.php to execute commands once