Fix typo on help text (#3227)

* Fix typo on help text

Fix typo on `allow anyone to join this team` help text.

* Added fix to webapp/i18n/en.json

webapp/components/team_general_tab.jsx

@@ -314,7 +314,7 @@ class GeneralTab extends React.Component {
                         <br/>
                         <FormattedMessage
                             id='general_tab.openInviteDesc'
-                            defaultMessage='When allowed, a link to this team will be including on the landing page allowing anyone with an account to join this team.'
+                            defaultMessage='When allowed, a link to this team will be included on the landing page allowing anyone with an account to join this team.'
                         />
                     </div>
                 </div>

webapp/i18n/en.json

@@ -872,7 +872,7 @@
   "general_tab.includeDirDesc": "Including this team will display the team name from the Team Directory section of the Home Page, and provide a link to the sign-in page.",
   "general_tab.includeDirTitle": "Include this team in the Team Directory",
   "general_tab.no": "No",
-  "general_tab.openInviteDesc": "When allowed, a link to this team will be including on the landing page allowing anyone with an account to join this team.",
+  "general_tab.openInviteDesc": "When allowed, a link to this team will be included on the landing page allowing anyone with an account to join this team.",
   "general_tab.openInviteTitle": "Allow anyone to join this team",
   "general_tab.regenerate": "Re-Generate",
   "general_tab.required": "This field is required",