Add --workspace-concurrency to run docs

[maschwenk]

This has been a point of confusion for me for a while. I almost never use -r and instead use --filter to run my scripts. I've used:

pnpm -F packageA -F packageB -F packageC --workspace-concurrency=1 scriptName

Quite a bit and it works. I've always wondered why --workspace-concurrency was only buried in the recursive docs. The command above I believe is really just syntactic sugar for:

pnpm -F packageA -F packageB -F packageC --workspace-concurrency=1 run scriptName

So I think this is the right place for this to be documented? Or is It more of a global option? I assuming using --filter has nothing to do with recursive mode? It seems like it can be used to have a similar effect but is completely different tool.

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