docs(docs/.style/style-guide): add directional-language and contractions rules - #26729

…p existing pages

Add a new accessibility-and-inclusion rule that warns against spatial references like "see below", "above", or "the menu on the left", which screen-reader users navigating linearly cannot interpret. The rule prescribes anchor links, section headings, document order ("the previous section", "the following section"), and named UI elements instead. A replacement table covers the common cases.

Sweep the six style-guide subpages so the existing rule examples and prose comply. Captions "go below" become captions that "follow". "At the top of the page" becomes "at the beginning of the page". "As described below" inside the Latin abbreviations table dropped; the next paragraph supplies the detail. "10th and up" becomes "10th and higher". "As shown above" inside the screenshot-as-content Don't example becomes "as shown in the screenshot".

Idiomatic stack metaphors ("built on top of Terraform") and phrasal verbs ("set up", "back up", "log in", "shut down") are explicitly carved out and stay as-is.

Lints clean: make lint/markdown and make lint/prose.

Add a new voice-and-tone rule that prefers contractions in body prose for the same reason the docs use second person and present tense: the prose should read like a person talking to the reader.

Three exceptions. (1) Auxiliary contractions like 'you'd', 'there's', 'it's', 'we'd', and 'they're' cannot end a sentence because the elided verb form goes missing with them. Negation contractions like 'don't', 'won't', and 'can't' end sentences fine. (2) Contractions join exactly two words. Triple-word contractions like 'you'd've' and 'wouldn't've' get expanded to one of two forms ('you would've' or 'you'd have') depending on which reads more naturally. (3) Data loss, security warnings, and irreversible operations get the full visual weight of 'do not', 'cannot', and 'will not'.

Section lands between 'Present tense by default' and 'Trailing prepositions are a judgment call' because all three rules sit in the natural-phrasing cluster of voice-and-tone.

Lints clean: make lint/markdown and make lint/prose.

…rtunities

Apply the contractions rule across the existing style-guide subpages. 76 lines updated where the spelled-out form ('does not', 'is not', 'cannot', 'you have', 'there is', 'that is') reads more naturally as a contraction.

Skipped: Don't blocks inside the contractions rule that intentionally demonstrate the wrong form; Do blocks inside the emphasis sub-rule that intentionally model 'do not', 'cannot', and 'will not' for high-stakes operations; the Churchill joke inside the trailing-prepositions Don't blocks; and the 'that is' dictionary definition of i.e. in the Latin abbreviations table.

Skipped 'may not' (no contraction in modern English), 'must not' (zero matches), and 'that has' relative clauses where ''s' could read as possessive.

Lints clean: make lint/markdown and make lint/prose.