Updates to CONTRIBUTING.md (open-telemetry#5878)

* Updates to CONTRIBUTING.md

* Java 11+

CONTRIBUTING.md

@@ -1,17 +1,18 @@
 ## Contributing
 
-Pull requests for bug fixes are welcome, but before submitting new features
-or changes to current functionality [open an
-issue](https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/new)
-and discuss your ideas or propose the changes you wish to make. After a
-resolution is reached a PR can be submitted for review.
+Pull requests for bug fixes are always welcome!
+
+Before submitting new features or changes to current functionality, it is recommended to first
+[open an issue](https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/new)
+and discuss your ideas or propose the changes you wish to make.
+
+### Building
 
 In order to build and test this whole repository you need JDK 11+.
+
 Some instrumentations and tests may put constraints on which java versions they support.
 See [Running the tests](./docs/contributing/running-tests.md) for more details.
 
-### Building
-
 #### Snapshot builds
 
 For developers testing code changes before a release is complete, there are
@@ -21,7 +22,7 @@ the Sonatype OSS snapshots repository at `https://oss.sonatype.org/content/repos
 
 #### Building from source
 
-Build using Java 11:
+Build using Java 11+:
 
 ```bash
 java -version