doc: Correct pull request prefix for scripts and tools

[maflcko]

script is confusing, because in the context of Bitcoin, it usually means Bitcoin script (c.f. CScript in script.h, or pull requests such as #27122 using the prefix).

This could be fixed by renaming it to scripts (with a plural s at the end), however, looking at the current usage contrib and cli seem more common (#29687, #26953, #26584, #24864, #30074, #29433 ...)

[DrahtBot]

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ACK	fanquake, willcl-ark, hebasto, theuni

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[fanquake]

ACK fa3e115

[willcl-ark]

ACK fa3e115

I'm half tempted to bikeshed this to using tools, but this also seems totally fine to me :)

[maflcko]

I'm half tempted to bikeshed this to using tools, but this also seems totally fine to me :)

The bot will understand it, so you are free to use it. :)

Edit: But I haven't seen anyone use it yet, so updating the docs can be done as a follow-up when people are using tools.

[hebasto]

ACK fa3e115.

[theuni]

ACK fa3e115