[Doc] Update Swift Community-Hosted CI pull request testing trigger doc

Author: shahmishal

docs/ContinuousIntegration.md

@@ -14,9 +14,11 @@
     - [Specific Preset Testing](#specific-preset-testing)
     - [Build Swift Toolchain](#build-swift-toolchain)
     - [Testing Compiler Performance](#testing-compiler-performance)
+    - [Swift Community Hosted CI Pull Request Testing](#swift-community-hosted-ci-pull-request-testing)
 - [Cross Repository Testing](#cross-repository-testing)
 - [ci.swift.org bots](#ciswiftorg-bots)
 
+
 ## Introduction
 
 This page is designed to assist in the understanding of proper practices for testing for the Swift project. 
@@ -219,6 +221,16 @@ apple/swift-lldb#48
 
 4. Watch the public incremental build on [ci.swift.org](https://ci.swift.org/) to make sure that you did not make any mistakes. It should complete within 30-40 minutes depending on what else was being committed in the mean time.
 
+### Swift Community Hosted CI Pull Request Testing
+
+Currently, supported pull request testing triggers:
+
+Platform     | Comment | Check Status
+------------ | ------- | ------------
+Windows      | @swift-ci Please test Windows platform | Swift Test Windows Platform
+Linux        | @swift-ci Please test Tensorflow Linux platform | Swift Test Linux Platform (TensorFlow)
+Linux (GPU)  | @swift-ci Please test Tensorflow Linux GPU platform |Swift Test Linux Platform with GPU (TensorFlow)
+macOS        | @swift-ci Please test Tensorflow macOS platform | Swift Test macOS Platform (TensorFlow)
 
 ## ci.swift.org bots
 
@@ -231,3 +243,6 @@ FIXME: FILL ME IN!
 3. @swift-ci pull request testing becomes less effective since one can not perform a test and merge and one must reason about the source of a given failure.
 
 <a name="footnote-2">[2]</a> This is due to unrelated issues relating to running lldb tests on macOS.
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