github pr templates: docs, new example and generic one

Author: 9prady9

.github/PULL_REQUEST_TEMPLATE/documentation.md

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+<!--
+Short description of change in documentation
+-->
+
+Description
+-----------
+<!--
+Additional information about the PR answering following questions:
+
+* Is this new addition to documentation ?
+* Is this change correction of existing documentation?
+* More detail if necessary to describe all commits in pull request.
+-->
+Fixes: #<issue number> ...
+
+Checklist
+---------
+- [ ] Rebased on latest master
+- [ ] Documentation Generation Successful
+- [ ] Documentation Tests Pass

.github/PULL_REQUEST_TEMPLATE/generic_pr_template.md

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+
+<!--
+Short description of change
+
+This should be one or two sentences that describe the overall
+motivation of the PR. Description of what was done for an unfamiliar
+reviewer.
+-->
+
+Description
+-----------
+<!--
+Additional information about the PR answering following questions:
+
+* Is this a new feature or a bug fix?
+* More detail if necessary to describe all commits in pull request.
+* Why these changes are necessary.
+* New functions and their functionality.
+* Future changes not implemented in this PR.
+-->
+Fixes: #<issue number> ...
+
+Changes to Users
+----------------
+<!--
+* Additional options added to the build.
+* What changes will existing users have to make to their code or build steps?
+-->
+
+Checklist
+---------
+<!-- Check if done or not applicable -->
+- [ ] Rebased on latest master
+- [ ] Code compiles
+- [ ] Tests pass
+- [ ] Functions documented

.github/PULL_REQUEST_TEMPLATE/new_example.md

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+<!--
+Short description of the new example
+-->
+
+Description
+-----------
+<!--
+What feature of rust wrapper or ArrayFire is the example show casing?
+-->
+
+Checklist
+---------
+- [ ] Rebased on latest master
+- [ ] Code compiles