Fix smart quotes and placeholder URLs in docs

[kmcginnes]

Description

Mechanical cleanup of documentation text.

• Replace curly/smart quotes with straight quotes in docs/guides/troubleshooting.md and docs/development.md
• Replace real Neptune cluster URL (cluster-cqmizgqgrsbf) with placeholder {your-cluster-id} in docs/references/default-connection.md

Validation

Documentation-only change. Verified no smart quotes remain via hexdump and no real cluster URLs remain via grep.

Related Issues

• Part of Final cleanup #1581
• Part of Documentation cleanup #1577

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have verified pnpm checks passes with no errors.
• I have verified pnpm test passes with no failures.
• I have covered new added functionality with unit tests if necessary.
• I have updated documentation if necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.65%. Comparing base (c5affc5) to head (e6b37e1).
⚠️ Report is 140 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1693       +/-   ##
===========================================
+ Coverage   47.81%   72.65%   +24.83%     
===========================================
  Files         382      408       +26     
  Lines        8525    12286     +3761     
  Branches     3159     3525      +366     
===========================================
+ Hits         4076     8926     +4850     
+ Misses       3070     2340      -730     
+ Partials     1379     1020      -359     

Flag	Coverage Δ
unittests	72.65% <ø> (+24.83%)	⬆️

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[kmcginnes]

Low risk, merging without review.