fix: correct NetSuite capitalization, SuiteScript spelling and SFTP placeholder consistency

[bhardwajdiv]

Summary
Fixes typos and inconsistencies in the NetSuite inventory integration page.

Changes

• Fixed "Netsuite" → "NetSuite" in 2 places (paragraph 1 and Key Objectives)
• Fixed "Suite Script" → "SuiteScript" under Handling Extensive Inventory Records section
• Fixed inconsistent SFTP placeholder: {sftp.user} → {sftp-username} to match the format used elsewhere in the same file

Page affected
https://docs.hotwax.co/documents/learn-netsuite/integration-flows/inventory

[gemini-code-assist]

Code Review

This pull request corrects the capitalization of "NetSuite" and updates an SFTP path variable in the inventory integration documentation. Feedback was provided to rephrase a sentence to better align with the HotWax style guide by removing the discouraged adjective "vital" and simplifying the language for improved readability.

[dt2patel]

This still has unresolved review feedback on the opening copy in the inventory guide. Please tighten the wording per the inline comment before merge.

[bhardwajdiv]

Hi Sir, I have addressed the inline feedback by simplifying the opening copy in the inventory guide. The word "vital" has been removed and the sentence has been rephrased for clarity. Kindly re-review