docs: Correct grammar in account information storage description

[0xbryer]

Description

While reviewing the documentation, I noticed a grammatical error in the sentence "information about accounts are stored." Since "information" is an uncountable noun, it should be followed by a singular verb.

I've corrected it to "information about accounts is stored" for clarity and accuracy.

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

[Eikix]

Sorry for the late reply and lack of review. We've been pausing the development of kakarot for now.

I'm cognizant that you spent some time doing this PR, so thank you. I will have to close it since I am cleaning a bit the repo and preparing for archival.

Archiving the repo will solve issue of people working on stuff while we are not accepting new PRs.
Thanks for understanding