docs: fix typos, formatting, and broken links across docs and source

[ZLeventer]

Summary

Fixes 20+ typos, grammar issues, formatting inconsistencies, and broken links across documentation and source files:

Typos

• "gaurantee" → "guarantee" in 5 package READMEs
• "Interal" → "Internal" in 2 package.json descriptions
• "puproses" → "purposes" in EXAMPLE provider (2 files)
• "truely" → "truly" in EXAMPLE provider test
• "resole" → "resolve" in get_username tool description
• "the the" → "the" in DEVELOPING.md

Formatting & grammar

• Double period in aura-experts toolset description
• Broken sentence in create_lwc_component_from_prd description ("structure. and")
• Tool name mismatch: run_apex_tests (plural) in prose vs run_apex_test (singular) everywhere else
• Missing (NON-GA) label on create_mobile_lwc_payments
• Trailing space before ] in markdown link
• Double space in sfDevopsListWorkItems tool description
• Leading space in create_org_snapshot description param
• Lowercase salesforce → Salesforce in delete_org description
• Garbled sentence in get_username tool description
• Grammar fix in Dependabot section
• "a MCP" → "an MCP" in code-analyzer package.json

Structural

• Broken markdown link syntax in packages/mcp/DEVELOPING.md
• Removed internal Confluence URL from public EXAMPLE provider

Test plan

• All changes are in string literals, markdown, and package.json descriptions — no logic changes
• yarn build should pass unchanged
• Verify rendered markdown in GitHub preview

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @ZLeventer to sign the Salesforce Inc. Contributor License Agreement.

[ZLeventer]

Signed the CLA

[ZLeventer]

@salesforce-cla recheck

[ZLeventer]

I've signed the Salesforce CLA — recheck should pass now.