Docs: Fix multiple typos, grammar, and formatting issues

[noruzzamans]

Summary

Fixed multiple typos, grammar issues, and formatting inconsistencies across the documentation.

Files Changed (8 files, 10 fixes)

Grammar Fixes

• docs/contributing.md: Added missing article "a" before "convincing reason"
• docs/services/lighthouse-server.md: "is ran through" → "is run through"
• docs/services/index.md: "are ran by" → "are run by"

Typo Fixes

• docs/gcp/google-cloud-sql.md: "he start time" → "The start time"
• docs/gcp/google-cloud-firestore.md: "CLoud" → "Cloud"
• docs/aws/index.md: "Enpoints" → "Endpoints" (2 instances)

Formatting Fixes

• docs/gcp/google-kubernetes-engine.md: Added missing space before backticks (2 instances)
• docs/installation/index.md: "Finally." → "Finally," (period to comma)