fix: normalize prose-form relational operators in req.irql across 239 files

[cristeigabriela]

Context: This is part of a series of pull requests.

I am working on a sister project to sparse, the sdk-api parser, and in the process, I automated finding issues in windows-driver-docs-ddi (I've also done this for sdk-api.)

I'm now submitting patches for everything I've found for review. All the changes were tested in a branch where all of them are applied, and every single YAML frontmatter parses correctly.

All 12 PRs in this series — merging guide

#	PR	Branch	Files
1	#1660	fix/typos-frontmatter	5
2	#1661	fix/acxmisc-acxobjectbagretrieveblob-irql	1
3	#1662	fix/iddcx-irql-empty	14
4	#1663	fix/silo-and-reparse-irql	8
5	#1664	fix/portcls-na-dll	2
6	#1665	fix/irql-apc-level-spacing	41
7	#1666	fix/irql-passive-abbreviation	2
8	#1667	fix/irql-dispatch-level-spacing	298
9	#1668	fix/ntoskrnl-lib-misfiled-as-dll	3
10	#1669	fix/strip-irql-prose-prefix	80
11	#1670	fix/irql-trailing-period-and-passive-case	133
12	(this PR)	fix/irql-prose-to-operator	239

All of the 12 PRs have zero pairwise file overlap. They can be merged individually, in any order, and there will not be merge conflicts between them.

After every PR is merged, all 10,915 nf-*.md frontmatter blocks will still parse cleanly as YAML.

A reference branch with all of the PRs merged at once is at integration/all-open-prs.

Several req.irql entries spell the relational operator out in prose instead of using the canonical symbolic form that the rest of the corpus uses. This normalizes them.

Before	After	Files
Less than or equal to APC_LEVEL	<= APC_LEVEL	235
Greater than or equal to DISPATCH_LEVEL	>= DISPATCH_LEVEL	2
Greater than or equal to PASSIVE_LEVEL (See Remarks section)	>= PASSIVE_LEVEL (see Remarks section)	1
Greater than DISPATCH_LEVEL	> DISPATCH_LEVEL	1

The four values that begin with > or >= are single-quoted in the YAML frontmatter (req.irql: '>= DISPATCH_LEVEL') so the frontmatter remains valid YAML — > at the start of a plain scalar is the folded-scalar indicator in YAML, and an unquoted >= DISPATCH_LEVEL would fail to parse.

This collapses the <= APC_LEVEL bucket from 601 entries to 836 (it now absorbs the 235 prose-form entries), and brings the Greater than ... outliers into the same shape as the 1037 <= DISPATCH_LEVEL entries.