x86spec: fix header parsing

[anton-kuklin]

The existing implementation of the Intel x86 doc parser matches headers by just trimming spaces. However, there are cases, when a header string takes several lines, which breaks current switch case matching, e.g. during the parsing of AMX operations. This commit fixes it by replacing \n with a whitespace in a header string.

For: golang/go#61079

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Message from Anton Kuklin:

Patch Set 2:

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Message from Cherry Mui:

Patch Set 2: Run-TryBot+1

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Patch Set 2:

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Patch Set 2: TryBot-Result+1

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Message from Anton Kuklin:

Patch Set 4:

(3 comments)

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Patch Set 2:

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Patch Set 2: Run-TryBot+1

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Patch Set 2: TryBot-Result+1

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Message from Anton Kuklin:

Patch Set 4:

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