IGNITE-13140 Fixed Pull Request checklist

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,7 +10,7 @@ we ask you to ensure the following steps have been taken:
 - [ ] The pull request body describes changes that have been made. 
 The description explains _WHAT_ and _WHY_ was made instead of _HOW_.
 - [ ] The pull request title is treated as the final commit message. 
-The following pattern must be used: `IGNITE-12407: Add Cluster API support to Java thin client`
+The following pattern must be used: `IGNITE-XXXX Change summary` where `XXXX` - number of JIRA issue.
 - [ ] A reviewer has been mentioned through the JIRA comments 
 (see [the Maintainers list](https://cwiki.apache.org/confluence/display/IGNITE/How+to+Contribute#HowtoContribute-ReviewProcessandMaintainers)) 
 - [ ] The pull request has been checked by the Teamcity Bot and 
@@ -22,4 +22,4 @@ the `green visa` attached to the JIRA ticket (see [TC.Bot: Check PR](https://mtc
 - [Coding Guidelines](https://cwiki.apache.org/confluence/display/IGNITE/Coding+Guidelines)
 - [Apache Ignite Teamcity Bot](https://cwiki.apache.org/confluence/display/IGNITE/Apache+Ignite+Teamcity+Bot)
 
-If you need any help, please email dev@ignite.apache.org or ask anу advice on http://asf.slack.com _#ignite_ channel.
+If you need any help, please email dev@ignite.apache.org or ask anу advice on http://asf.slack.com _#ignite_ channel.