You won't be able to update the manual table of contents like the one Google Docs generates automatically. When you edit the document headings, you will have to edit the ToC manually. To do that ...

These Google Docs tabs let you separate different bunches of pages within a single document. They're a little bit like a table of contents or a series of bookmarks, but not quite the same—they ...

Are you having trouble merging cells in your Google ... in a table; if you have questions about the tutorial, let us know in the comments. Read next: How to add and edit Tables in Google Docs.