Amend potential bug tag with bug

Signed-off-by: Deyu Huang <[email protected]>

Author: hwangdeyu

.github/ISSUE_TEMPLATE/bug-performance-issue.md

@@ -2,7 +2,7 @@
 name: Bug/Performance issue
 about: Use this template for reporting a bug or a performance issue.
 title: ''
-labels: 'potential bug'
+labels: 'bug'
 assignees: ''
 ---
 

.github/ISSUE_TEMPLATE/operators.md

@@ -1,6 +1,6 @@
 ---
 name: Missing Operator
-about: Operators that does not currently support in tf2onnx.
+about: Operator that does not currently support in tf2onnx.
 title: ''
 labels: 'unsupported ops'
 assignees: ''