Update documentation template to match recommendations from doc sprints

.github/ISSUE_TEMPLATE/20-documentation-issue.md

@@ -4,14 +4,33 @@ about: Use this template for documentation related issues
 
 ---
 
-<em>Please make sure that this is a documentation issue. As per our [GitHub Policy](https://github.com/tensorflow/tensorflow/blob/master/ISSUES.md), we only address code/doc bugs, performance issues, feature requests and build/installation issues on GitHub. tag:doc_template</em>
+<em>Thanks so much for taking the time to file a documentation issue and even more thanks if you intend to contribute to updating it! Please do introduce yourself on our Mailing List via [Google Groups](https://groups.google.com/a/tensorflow.org/forum/#!forum/docs) or [email](mailto:docs@tensorflow.org list) and let us know if you have any questions. We also encourage you to review our [Documentation Contributor Guide](https://www.tensorflow.org/community/contribute/docs). As a side note, per our [GitHub Policy](https://github.com/tensorflow/tensorflow/blob/master/ISSUES.md), we only address code/doc bugs, performance issues, feature requests and build/installation issues on GitHub. tag:doc_template</em>
 
+## Existing URLs containing the issue:
+Link to the documentation entry, for example: https://www.tensorflow.org/versions/r2.0/api_docs/python/tf/MyMethod
 
-**System information**
-- TensorFlow version:
-- Doc Link:
+## Description of issue (what needs changing):
 
+### Correct Links
+Is the link pointing to the source code correct? To find the source code, use `git grep my_method` from the git command line in your locally checked out repository.
 
-**Describe the documentation issue**
+### Clear Description
+Why should someone use this method? How is it useful?
 
-**We welcome contributions by users. Will you be able to update submit a PR (use the [doc style guide](https://www.tensorflow.org/community/documentation)) to fix the doc Issue?**
+### Usage Example
+Is there a usage example?
+
+### Parameters Defined
+Are all arguments that can be passed in defined and formatted correctly?
+
+### Returns Defined
+Are return values defined?
+
+### Raises Listed and Defined
+Are errors defined? [Example](https://www.tensorflow.org/versions/r2.0/api_docs/python/tf/feature_column/categorical_column_with_vocabulary_file#raises)
+
+### Request Visuals, if Applicable
+Are there currently visuals? If not, would they make the content clearer?
+
+### Submit PR?
+Are you planning to also submit a [Pull Request](https://help.github.com/en/articles/about-pull-requests) to fix this issue? See the [Documentation Contributor Guide](https://www.tensorflow.org/community/contribute/docs) the [Documentation Style Guide](https://www.tensorflow.org/community/contribute/docs_style).