Fix grammar and invalid nodeAffinity example in Schedule GPUs

[amekala2514]

Description

This PR makes two small corrections to the Schedule GPUs task page
(content/en/docs/tasks/manage-gpus/scheduling-gpus.md):

1. Grammar: "By default NFD create" → "By default, NFD creates" (subject-verb agreement).
2. The Node Feature Discovery nodeAffinity example was missing the required operator field on one match expression. operator is required on a NodeSelectorRequirement, so the manifest as written would fail API validation. Added operator: In, consistent with the values: ["true"] already present.

Issue

No open issue — these are minor, self-evident documentation fixes.

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[lmktfy]

Thanks for the PR. Did you get AI help writing this?

(it's OK to use AI tools, but if you did, you must say so)

[amekala2514]

@lmktfy I used AI to draft the comment not to make the fixes to the documentation. This is my first PR, so didn't know the exact process.