Add new idf.showHintsNotification in documentation

Author: radurentea

docs_espressif/en/settings.rst

@@ -214,6 +214,8 @@ Extension Behaviour Settings
       - Absolute path to shell terminal executable to use (default to VS Code Terminal)
     * - **idf.customTerminalExecutableArgs**
       - Shell arguments for idf.customTerminalExecutable
+    * - **idf.showHintsNotification**
+      - Show pop-up notifications when hints are found for compilation errors (default ``true``)
 
 
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