Edits to Analytics for Node.js

[rchinn1]

This pull request makes a series of documentation improvements to the Segment Analytics Node.js library guide. The changes focus on consistency, clarity, and grammar, updating terminology to match Segment's conventions and improving the readability of instructions and field descriptions.

Key documentation and terminology improvements:

• Standardized capitalization and terminology for method names and calls (e.g., "Track call" instead of "track call", "Page call" instead of "page call") throughout the guide for consistency. [1] [2] [3] [4]
• Improved grammar and clarity in explanatory text and field descriptions, such as clarifying instructions for replacing the write key, updating lists to use serial commas, and rephrasing recommendations for best practices. [1] [2] [3]
• Updated section and table headings to use consistent capitalization and style, such as "Getting started", "Emitter types", and "Selecting destinations". [1] [2] [3] [4]

Content accuracy and guidance:

• Enhanced accuracy in descriptions of Segment features, such as clarifying which destinations accept historical imports and updating recommendations for filtering events in the UI.
• Improved explanations of SDK configuration options, such as custom fetch implementations, for better developer guidance.

These changes collectively improve the quality and usability of the documentation for developers integrating Segment Analytics with Node.js.

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