text: Title: Documentation incorrectly claims that `--tagdoc` documentation supports HTML formatting
  Body: Hello,
  
  Issue found with
  $ rebot --version
  Rebot 7.0.1 (Python 3.10.11 on win32)
  
  I'm trying to use basic formatting with --tagdoc option, like
  rebot --tagdoc "my_tag:\*my_doc\*" report.xml
   
  But it's not interpreted like bold formatting like documentation said, same for italic formatting.
  
     --tagdoc pattern:doc *  Add documentation to tags matching the given
                            pattern. Documentation is shown in `Test Details` and
                            also as a tooltip in `Statistics by Tag`. Pattern can
                            use `*`, `?` and `[]` as wildcards like --test.
                            Documentation can contain formatting like --doc.
                            Examples: --tagdoc mytag:Example
                                      --tagdoc "owner-*:Original author"
  
  
  Also, --doc support documentation from file, but this is not the case for --tagdoc.
  
  Rgds
  SebC
  
  
  