Update GH issue type titles

Author: seratch

.github/ISSUE_TEMPLATE/02_enhancement.md

@@ -1,5 +1,5 @@
 ---
-name: Enhancement / Feature Request
+name: SDK Enhancement / Feature Request
 about: Submit an enhancement/feature request
 title: (Set a clear title describing your idea)
 labels: 'untriaged'

.github/ISSUE_TEMPLATE/03_document.md

@@ -1,5 +1,5 @@
 ---
-name: Document
+name: SDK Document
 about: Submit an issue on documents
 title: (Set a clear title describing your idea)
 labels: 'untriaged'

.github/ISSUE_TEMPLATE/04_bug.md

@@ -1,5 +1,5 @@
 ---
-name: Bug
+name: SDK Bug
 about: Report the SDK bug
 title: (Set a clear title describing the issue)
 labels: 'untriaged'