Update category-exporter.md

[annapostl]

We'd like to update the script for category exporter a bit, based on the issues the customer in this ticket https://commercetools.atlassian.net/browse/SUPPORT-24058 had.

@VineetKumarKushwaha please take a look and update anything you think should be updated about the script

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Latest commit: 02764705492fb2c77da0958bad7dca018b6dcc0f

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a4de02c) 94.75% compared to head (0276470) 94.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1888 +/- ## ======================================= Coverage 94.75% 94.75% ======================================= Files 147 147 Lines 5057 5057 Branches 1375 1375 ======================================= Hits 4792 4792 Misses 262 262 Partials 3 3 ```

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