[readme] use "cannot" (one word) in two prose passages

[Bojun-Vvibe]

Repo: airbnb/javascript (⭐ 148126)
Type: docs
Files changed: 1
Lines: +2/-2

What

Replaces two occurrences of the two-word "can not" with the standard one-word "cannot" in the main README prose (sections 7.14 and 23.10). The two-word form is grammatically valid only when "not" belongs to a following construction (e.g., "can not only X but Y"); in both edited passages the meaning is plain negation, where modern usage guides recommend "cannot".

Why

Minor copy-edit for consistency with conventional written English. The rest of the guide already uses contractions like "don't" and "can't" or the single word "cannot" elsewhere; these two stragglers read awkwardly. No semantic change.

Testing

Pure prose change in README.md — no code paths touched. Verified rendered Markdown is unaffected (no link or list structure modified) by inspecting the diff. No test suite needs to run.

Risk

Low — documentation-only, two-word swap with no link, anchor, or example code changes.

[ljharb]

I don't see that as a common convention nor do i like it. Separately, please do not use LLMs to automate PRs.