fix: clean up spacing in PREVRANDAO documentation

[pengqima]

Remove accidental extra spaces from the PREVRANDAO stack output description.

This changes “previous block's RANDAO mix” to “previous block's RANDAO mix”, improving readability and keeping the documentation formatting consistent.

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PR Summary

Low Risk
Documentation-only wording/spacing change with no runtime or API impact.

Overview
Fixes double spaces in the PREVRANDAO (44_merge.mdx) stack output line so it reads “previous block's RANDAO mix” instead of “previous block's” and “RANDAO” with extra gaps. No behavioral or opcode semantics change—documentation formatting only.

^{Reviewed by Cursor Bugbot for commit 74b5122. Configure here.}

[pengqima]

@2xic @a-monteiro Hi, Could you please review this PR at your convenience? Thank you very much.

[2xic]

@pengqima I don't think this has any user impact as it currently is. What is the benefit of merging this?

[pengqima]

@pengqima I don't think this has any user impact as it currently is. What is the benefit of merging this?

You're right — HTML collapses consecutive whitespace, so this does not change the rendered output. I initially considered the source consistency and readability worthwhile, but I agree that this alone does not provide enough benefit to justify the change.