This pull request makes a number of editorial and clarity improvements to the src/connections/spec/common.md documentation. The main focus is on improving grammar, consistency, formatting, and the precision of language, as well as updating links and code references for clarity.

Documentation improvements:

• Improved grammar, punctuation, and clarity throughout the document, including more consistent capitalization of terms (e.g., "Identify call", "Analytics.js", "Track event") and improved explanation of context fields. [1] [2] [3]
• Updated and clarified table entries for context fields, including better descriptions, capitalization, and formatting of example values and notes.
• Enhanced timestamp section with improved explanations, punctuation, and formatting, including clarifying the calculation and recommended usage of each timestamp field. [1] [2]
• Refined FAQ section with more readable headings, improved explanations, and updated internal documentation links to use relative paths where appropriate.

Proposed changes

Merge timing

Related issues (optional)

Related to Doc-1229