Address review feedback: improve clarity and add examples

[Copilot]

Addressed 11 review comments from code review on documentation clarity, grammar, and examples.

Grammar and terminology fixes

• Fixed "varies on" → "varies based on" for grammatical correctness
• Corrected article usage: "an frontend API" → "a frontend API"
• Updated terminology: "Nosto backend" → "Nosto Admin UI", "Nosto-hosted templates" → "templates hosted at Nosto"
• Removed temporal qualifier from SKU limitation statement for clarity

Improved clarity

• Changed "One or multiple modules" → "One or both of the following Nosto modules"
• Refined client guidance from "will tell you" → "will guide you on setting up"
• Clarified customer data context: "if the customer is logged in" → "customer details if the customer is logged in"
• Added context qualifier "when using a custom code setup" for API approach recommendation

Added examples and references

• Added Session API page tracking code example:

nostojs(api => {
  api.defaultSession()
    .viewProduct("product-123")
    .setPlacements(api.placements.getPlacements())
    .load()
});

• Added reference link to parameterless attribution documentation for DOM injection section

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