You will have to select ‘Voice typing’ in the Tools menu when you are using Docs in Chrome following which you will see a microphone icon alongside the document. Google will listen to your voice commands after clicking that symbol. You can start editing and formatting with commands like ‘copy,” “insert table,” and “highlight.” In addition, the feature will let you highlight and replace a word, as well as start lists or change heading formats. Going forward, users can give breaks into paragraph, add bullet point lists, select specific text, apply different text formats and even add a text smiley face.
It must be noted that the formatting and editing voice command functionality only works when using Docs in Chrome. Also voice commands are only available for English language documents. You can visit here for more detailed information about Google Docs voice commands.