docs: fix spelling and grammar errors on paper ballots page

[masiarek]

Description

Copy-editing pass over the Paper Ballots help page (docs/help/paper_ballots.md). Text-only, no code touched. Ten fixes on nine lines, in two commits.

Spelling (2)

1. "Propositional STAR" → "Proportional STAR" — the heading directly above this sentence and the bullet directly below it both already say "Proportional", so this line was the odd one out.
2. "pupulation" → "population" — Eugene, OR, in the Gravic/Remark section.

Grammar, agreement, and word choice (8)

3. "each score read is correctly" → "each score is read correctly" — transposed words in the hand-count observer roles.
4. "your voters personal identifying information" → "your voters' personal…" — missing possessive apostrophe.
5. "every voter receive a hard copy receipt" → "receives" — subject–verb agreement.
6. "a voter's name and email addresses confirmed" → "email address" — number agreement with the singular "a voter's".
7. "verify a voter's addresses and then use their address" → "a voter's address" — same, and the rest of the sentence already treats it as singular.
8. "Advanced registration" → "Advance registration" — "advance" is the sense meant (beforehand), and it is what the page itself uses in the "Remote registration without advance registration" heading further down.
9. "a post marked piece of mail" → "a postmarked piece of mail" — closes the compound, matching the correctly-spelled "postmarked" two paragraphs later.
10. "(which runs elections for the City of Eugene,)" — dropped the stray comma before the closing parenthesis.

Fix 1 seemed worth more than ordinary typo hygiene: this is the page people copy ballot instructions off of when printing real paper ballots, and "propositional" is a plausible-looking word a reader could carry onto a printed ballot.

Deliberately left alone: the page's conversational register ("regardless if you are using STAR Voting or not", "All you'll need is a paper, pencil, and a calculator", "you'll have your winner!") and its hyphenation style ("full scale pilot", "time consuming", "3 person teams"). Those read as the author's voice and house style rather than errors, so they seemed yours to decide rather than mine.

No reflowing or whitespace changes — every hunk is a word-level edit on an otherwise untouched line.

One thing I noticed but did not change

The page ends with a dangling cross-reference:

More info on STAR Voting implementation costs and options for governmental elections can be found here:
STAR Voting Cost of Implementation

"STAR Voting Cost of Implementation" looks like it was meant to be a link but has no URL, so it renders as plain text. I did not know the intended target — happy to add it in this PR if you point me at it.

Screenshots / Videos (frontend only)

N/A — documentation text only.

Related Issues

None.

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[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Corrected spelling and grammar errors in the Proportional STAR description and Eugene election implementation cost information.

Walkthrough

The paper ballot documentation now correctly uses “Proportional STAR” and “population” in the relevant descriptions.

Poem

I’m a rabbit with a careful pen,
Fixing words from now to then.
“Proportional” stands bright and clear,
“Population” hops back here.
Two small edits, neat and right—
The ballot page now reads just right.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the documentation page and the spelling and grammar fixes included in the changes.
Description check	✅ Passed	The description includes the required sections and clearly explains the documentation changes, testing scope, and related issues status.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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