Fix Spelling, Capitalization, and Section Numbering in Documentation

[savvar9991]

1. Corrected the spelling error "atleast" to "at least".

The word "atleast" was used in the documentation, which is not a valid English word.

2. Fixed the capitalization of "Twitter".

The change to "Twitter" aligns the text with standard capitalization rules for proper nouns.

3. Adjusted the section numbering, changing "6. Review and Merge" to "4. Review and Merge".

The numbering of sections in the document was inconsistent, jumping from section 3 to section 6, skipping 4 and 5.
This adjustment ensures a logical and sequential flow, making the document easier to navigate.