…ion instructions

Corrected a grammatical error in the README.

The README file previously contained a minor grammatical error in the sentence
that described how to load the RedisJSON module in Redis. The word "it" was
unnecessary and made the sentence unclear. This commit removes the extraneous
word "it" to improve the clarity and readability of the instructions.

This change is purely cosmetic and does not impact the functionality of the code
or the module. It aims to provide more precise and understandable documentation.

No issues are associated with this change.