update release notes (#2722)

Author: bobbrow

Extension/ReleaseNotes.html

@@ -205,12 +205,8 @@ <h1>Microsoft C/C++ Extension for VS Code</h1>
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-                                    <h2 class="caption">September 2018 Update</h2>
-                                    <div>Thank you for installing the C/C++ extension. In the September update, we added a preview of semantic-aware Go To Definition. This allows Go To Definition to work for local variables.
-                                        In addition, when the Go To Definition request references a symbol defined in the current translation unit, other incorrect symbols in the workspace with the same identifier will be
-                                        filtered from the results.<br/>
-                                        <br/>
-                                        We also added a new setting: <code>C_Cpp.updateChannel</code> to facilitate installing Insiders releases of the C++ extension.<br/>
+                                    <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/>
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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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