docs: fix spelling in backend directory structure

[yosinn1-blip]

Fixes #1180

Changes:

• heirarchy -> hierarchy in docs/backend/backend_python/directory-structure.md (1 occurrence(s))
• accross -> across in docs/backend/backend_python/directory-structure.md (1 occurrence(s))
• handeling -> handling in docs/backend/backend_python/directory-structure.md (1 occurrence(s))

Verification:

• Applied exact text replacements against the current upstream base branch.
• Confirmed the pull request diff contains only the intended documentation typo fix(es).

Summary by CodeRabbit

• Documentation
  • Updated backend directory structure documentation with corrected spelling and improved descriptions of the directory hierarchy and layout.
  • Enhanced configuration and database sections with rewritten text for clearer explanations of component responsibilities and shared variable handling.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: 33254516-eea4-4fb1-adfe-016d2df94460

📥 Commits

Reviewing files that changed from the base of the PR and between 84985f6 and 2e6aa21.

📒 Files selected for processing (1)

• docs/backend/backend_python/directory-structure.md

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Walkthrough

This PR fixes spelling errors and improves clarity in the backend Python directory structure documentation. Line 5 corrects "heirarchy" to "hierarchy" in the app/ directory description, and lines 24–32 rewrite the config and database section with corrected spellings and clearer wording.

Changes

Documentation Spelling and Clarity Fixes

Layer / File(s)	Summary
Directory structure documentation corrections docs/backend/backend_python/directory-structure.md	Fixed spelling of "hierarchy" in app/ directory description and rewrote config/database section with corrected spellings ("accross" → "across", "handeling" → "handling") and clearer phrasing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested labels

Documentation

Poem

🐰 A rabbit hops through typos with care,
Fixing "heirarchy" floating in air,
"Accross" and "handeling" now align,
Docs shine clearer, documentation divine! ✨

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change—fixing spelling errors in the backend directory structure documentation.
Linked Issues check	✅ Passed	The PR successfully addresses all three spelling corrections required by issue #1180: heirarchy→hierarchy, accross→across, and handeling→handling.
Out of Scope Changes check	✅ Passed	All changes are directly related to correcting spelling errors in the documentation as specified in the linked issue; no out-of-scope modifications detected.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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