Fix spelling mistakes (comments only) (#25564)

Original Author : klemens <ka7@github.com>

Taking over previous PR as per
https://github.com/ansible/ansible/pull/23644#issuecomment-307334525

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/system/aix_inittab.py

@@ -91,7 +91,7 @@ EXAMPLES = '''
     state: present
   become: yes
 
-# Change inittab enrty startmyservice to runlevel "2" and processaction "wait".
+# Change inittab entry startmyservice to runlevel "2" and processaction "wait".
 - name: Change startmyservice to inittab
   aix_inittab:
     name: startmyservice

lib/ansible/modules/system/cronvar.py

@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Cronvar Plugin: The goal of this plugin is to provide an indempotent
+# Cronvar Plugin: The goal of this plugin is to provide an idempotent
 # method for set cron variable values.  It should play well with the
 # existing cron module as well as allow for manually added variables.
 # Each variable entered will be preceded with a comment describing the

lib/ansible/modules/system/crypttab.py

@@ -34,7 +34,7 @@ options:
   name:
     description:
       - Name of the encrypted block device as it appears in the C(/etc/crypttab) file, or
-        optionaly prefixed with C(/dev/mapper/), as it appears in the filesystem. I(/dev/mapper/)
+        optionally prefixed with C(/dev/mapper/), as it appears in the filesystem. I(/dev/mapper/)
         will be stripped from I(name).
     required: true
     default: null

lib/ansible/modules/system/gconftool2.py

@@ -243,7 +243,7 @@ def main():
     # Check if the current value equals the value we want to set.  If not, make
     # a change
     if current_value != value:
-        # If check mode, we know a change would have occured.
+        # If check mode, we know a change would have occurred.
         if module.check_mode:
             # So we will set the change to True
             change = True

lib/ansible/modules/system/iptables.py

@@ -139,7 +139,7 @@ options:
         matches it. The target can be a user-defined chain (other than the one
         this rule is in), one of the special builtin targets which decide the
         fate of the packet immediately, or an extension (see EXTENSIONS
-        below).  If this option is omitted in a rule (and the goto paramater
+        below).  If this option is omitted in a rule (and the goto parameter
         is not used), then matching the rule will have no effect on the
         packet's fate, but the counters on the rule will be incremented.
     required: false

lib/ansible/modules/system/user.py

@@ -1652,7 +1652,7 @@ class DarwinUser(User):
     def _update_system_user(self):
         '''Hide or show user on login window according SELF.SYSTEM.
 
-        Returns 0 if a change has been made, None otherwhise.'''
+        Returns 0 if a change has been made, None otherwise.'''
 
         plist_file = '/Library/Preferences/com.apple.loginwindow.plist'