Review and update template and vignette that is related to tm_g_lineplot.R

[shajoezhu]

• No typos, no wrong formats
• Make sure there is a meaningful description for every module function @shajoezhu, @khatril, @pawelru - adding here TLG-c general link
• @example tag, make sure it runs, fix if otherwise
• Make sure functions have @return tag to document the return value (@edelarua to decide which standard to use, they have all same output in form)
• no \dontrun tag, replace with if(interactive()) if needed
• tmc has argument_convention that serves as parameters template, make sure this is utilized correctly (i.e. no repetition of parameters).
• Adding links to specific templates in TLG-c if already mentioned