Typo fix + Plugin configuration + UI specific file

Global/JetBrains.gitignore

@@ -12,9 +12,13 @@
 # .idea/dataSources.xml
 # .idea/sqlDataSources.xml
 # .idea/dynamic.xml
-# and, if using gradle::
+# and this UI specific file
+# .idea/uiDesigner.xml
+# and, if using gradle:
 # .idea/gradle.xml
 # .idea/libraries
+# and, if using Mongo Explorer plugin
+# .idea/mongoSettings.xml
 
 ## File-based project format
 *.ipr
@@ -30,4 +34,4 @@ out/
 atlassian-ide-plugin.xml
 
 # generated by Crashlytics plugin (for Android Studio and Intellij)
-com_crashlytics_export_strings.xml
+com_crashlytics_export_strings.xml