docs: Add admonition to inputs and index words

[christopher-hakkaart]

• Add an admonition to point to Multiple input files section
• Add indexes to *, ?, a and wildcards to make them searchable

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[ewels]

Great! Only minor addition I might consider is saying explicitly in theprocess.md docs that these patterns also work for name and stageAs. Then it'll come up when folks (like me) search for stageAs.

[ewels]

  `name`
  : Specify how the file should be named in the task work directory. Can be a name or a pattern.

Also could we link to the multiple input files here? eg. "or a pattern" could be a link. That was the specific bit of text I was looking at for additional help.

[bentsherman]

I was hoping to do it the other way around -- incorporate the file pattern rules into the process reference somehow and link to it from the process page

[christopher-hakkaart]

Eventually, I was thinking of a whole new page. The process pages are already quite lengthy, so consolidating as much as possible into other pages/places would be helpful. A pattern rules page would have reasonably clear margins.