Remove duplicate section on fail-fast

[RobKenis]

The mention on fail-fast applying to the entire matrix is also included in the reusable block. This renders to the block being repeated in the documentation.

Why:

This Pull Request removes duplication of the same documentation on the same page, even the same paragraph.

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@RobKenis Thanks for updating this article! I'll get it approved and added to the merge queue once checks are passing.

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