docs: fixed some spelling problems in documents. (#9845)

Author: steverao

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 contact_links:
-  - name: GitHib Discussions
+  - name: GitHub Discussions
     url: https://github.com/open-telemetry/opentelemetry-java-instrumentation/discussions/new/choose
     about: Please ask questions here.
   - name: StackOverflow

README.md

@@ -56,7 +56,7 @@ This repository also publishes standalone instrumentation for several libraries
 that can be used if you prefer that over using the Java agent.
 Please see the standalone library instrumentation column
 on [Supported Libraries](docs/supported-libraries.md#libraries--frameworks).
-if you are looking for documentation on using those.
+If you are looking for documentation on using those.
 
 ## Getting Started