Update ReleaseNotes. (#3067)

Author: sean-mcmanus

Extension/ReleaseNotes.html

@@ -205,8 +205,8 @@ <h1>Microsoft C/C++ Extension for VS Code</h1>
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-                                    <h2 class="caption">October 2018 Update</h2>
-                                    <div>Thank you for installing the C/C++ extension. In the October update, we finished our semantic-aware implementation of Go To Definition. We also added IntegratedTerminal support for debugging.<br/>
+                                    <h2 class="caption">January 2019 Update</h2>
+                                    <div>Thank you for installing the C/C++ extension. In the January update, we added documentation comments for hover, completion, and signature help.<br/>
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                                         Additional features and bug fixes are detailed in the <a href="https://github.com/Microsoft/vscode-cpptools/releases">full release notes</a>.</div>
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@@ -231,9 +231,9 @@ <h3 class="caption">Getting Started</h3>
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                                     <h3 class="caption">Blog Posts</h3>
+                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/12/05/visual-studio-code-cpp-extension-october-2018-update-and-a-simplified-insiders-program/">October 2018 Update</a></div>
                                     <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/08/23/visual-studio-code-c-c-extension-august-2018-update/">August 2018 Update</a></div>
                                     <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/07/25/visual-studio-code-cc-extension-july-2018-update-and-intellisense-auto-configuration-for-cmake/">July 2018 Update</a></div>
-                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/06/21/visual-studio-code-cc-extension-june-2018-update/">June 2018 Update</a></div>
                                     <div><a href="https://blogs.msdn.microsoft.com/vcblog/2016/03/31/cc-extension-for-visual-studio-code/">C/C++ Extension anouncement</a></div>
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