docs: add a mention about resolved issues about ssl.

.github/ISSUE_TEMPLATE/BUG_REPORT.md

@@ -10,7 +10,7 @@ about: If something isn't working as expected 🤔
 
 - [ ] Updated grpc-swift to the latest version
 - [ ] I read the [Contribution Guidelines](https://github.com/grpc/grpc-swift/blob/master/CONTRIBUTING.md)
-- [ ] I searched for [existing GitHub issues](https://github.com/grpc/grpc-swift/issues)
+- [ ] I searched for [existing GitHub issues](https://github.com/grpc/grpc-swift/issues)(especially, there are many [resolved issues related to SSL](https://github.com/grpc/grpc-swift/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aclosed+ssl))
 
 ### Issue Description
 <!-- Please include what's happening, expected behavior, and any relevant code samples. 
@@ -18,7 +18,7 @@ Please wrap log statements and code in triple backticks (```) so they get printe
 -->
 
 ##### Complete output when running grpc-swift, including the stack trace and command used
-<!-- You can use environment variable for debug 
+<!-- You can use environment variables for debug 
 e.g. 
 export GRPC_TRACE=all
 export GRPC_VERBOSITY="DEBUG"
@@ -37,13 +37,16 @@ export GRPC_VERBOSITY="DEBUG"
 <details>
   <pre>
   
-| Key                         | Value                                                         |
-| --------------------------- | --------------------------------------------------------------|
-| OS Version                  |   x.x.x                                                       |
-| Swift Version               |   x.x.x                                                       |
-| Xcode Version               |   x.x.x                                                       |
-| gRPC-Swift Version          |   x.x.x                                                       |
-
+| Key                           | Value                                                         |
+| ----------------------------- | --------------------------------------------------------------|
+| OS Version                    |   x.x.x                                                       |
+| Swift Version                 |   x.x.x                                                       |
+| Xcode Version                 |   x.x.x                                                       |
+| gRPC-Swift Version            |   x.x.x                                                       |
+| gRPC-Swift Version            |   x.x.x                                                       |
+| protoc Version                |   x.x.x                                                       |
+| protoc-gen-swift Version      |   x.x.x                                                       |
+| protoc-gen-swiftgrpc Version  |   x.x.x                                                       |
   </pre>
 </details>