GitHub template grammar/spelling fixes

.github/ISSUE_TEMPLATE/BC_Break.md

 ---
 name: 💥 BC Break
-about: Have you encountered an issue during upgrade? 💣
+about: Have you encountered an issue during an upgrade? 💣
 ---
 
 <!--
@@ -18,15 +18,15 @@ Before reporting a BC break, please consult the upgrading document to make sure
 
 #### Summary
 
-<!-- Provide a summary desciribing the problem you are experiencing. -->
+<!-- Provide a summary describing the problem you are experiencing. -->
 
-#### Previous behavior
+#### Previous behaviour
 
-<!-- What was the previous (working) behavior? -->
+<!-- What was the previous (working) behaviour? -->
 
 #### Current behavior
 
-<!-- What is the current (broken) behavior? -->
+<!-- What is the current (broken) behaviour? -->
 
 #### How to reproduce
 

.github/ISSUE_TEMPLATE/Bug.md

@@ -14,11 +14,11 @@ about: Something is broken? 🔨
 
 #### Summary
 
-<!-- Provide a summary desciribing the problem you are experiencing. -->
+<!-- Provide a summary describing the problem you are experiencing. -->
 
 #### Current behavior
 
-<!-- What is the current (buggy) behavior? -->
+<!-- What is the current (buggy) behaviour? -->
 
 #### How to reproduce
 
@@ -28,7 +28,7 @@ If possible, also add a code snippet with relevant configuration, driver/platfor
 Adding a failing Unit or Functional Test would help us a lot - you can submit one in a Pull Request separately, referencing this bug report.
 -->
 
-#### Expected behavior
+#### Expected behaviour
 
-<!-- What was the expected (correct) behavior? -->
+<!-- What was the expected (correct) behaviour? -->
 

.github/ISSUE_TEMPLATE/Support_Question.md

@@ -10,7 +10,7 @@ about: Have a problem that you can't figure out? 🤔
 | Version     | x.y.z
 
 <!--
-Before asking question here, please try asking on Gitter or Slack first.
+Before asking a question here, please try asking on Gitter or Slack first.
 Find out more about Doctrine support channels here: https://www.doctrine-project.org/community/
 Keep in mind that GitHub is primarily an issue tracker.
 -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -8,4 +8,4 @@
 
 #### Summary
 
-<!-- Provide a summary your change. -->
+<!-- Provide a summary of your change. -->