docs: fix typos, grammar, and formatting in FAQ and code comments

examples/companion_radio/ui-new/UITask.cpp

@@ -875,7 +875,7 @@ char UITask::handleLongPress(char c) {
 }
 
 char UITask::handleDoubleClick(char c) {
-  MESH_DEBUG_PRINTLN("UITask: double click triggered");
+  MESH_DEBUG_PRINTLN("UITask: double-click triggered");
   checkDisplayOn(c);
   return c;
 }