DOC-1500: Provide issues templates for public GitHub repositories

Author: anyt

.github/ISSUE_TEMPLATE/1_bug_report.md

@@ -16,7 +16,7 @@ about: Report unexpected behavior or a bug in the source code
 **Expected Result**  
 <!-- Suggestions for correct behavior -->
 
-**Details about your environment:**:
+**Details about your environment**
 - OroPlatform version: x.y.z
 - PHP version: x.y.z
 - Database (MySQL, PostgreSQL) version