chore(pages): typo in error messages

[ndom91]

Reasoning 💡

Small fix in the strings that get displayed as error messages on the signin page. See lines 24-35.

Our prettier settings weren't applied to this page yet as far as I can tell, so all that is in here as well :/

Checklist 🧢

• Documentation
• Tests
• Ready to be merged

Affected issues 🎟

[vercel]

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🔍 Inspect: https://vercel.com/nextauthjs/next-auth/5ghJdEHiTpVGqU6DnhGCfTRBTWVG
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[codecov-commenter]

Codecov Report

Merging #2265 (0b09fc1) into main (ad6c13c) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main   #2265      +/-   ##
========================================
- Coverage   9.97%   9.96%   -0.02%     
========================================
  Files         82      82              
  Lines       1393    1395       +2     
  Branches     393     395       +2     
========================================
  Hits         139     139              
- Misses      1028    1030       +2     
  Partials     226     226              

Impacted Files	Coverage Δ
src/server/pages/signin.js	0.00% <0.00%> (ø)

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