Update SetPedMoveRateOverride.md

[RealDebugg]

Before you submit this PR, please make sure:

• You have read the contribution guidelines
• You include an example that validates your change
• Your English is grammatically correct

https://i.imgur.com/OGoKRFT.png https://youtu.be/qiScU2sV8dQ

Added some examples as to how using the native affects a player, since its already stated that it needs to be within a loop, I feel that it is unnecessary to provide code example since documentation is fairly straight forward. The keywords that I've added would allow developers to search for "walk" and have this native be returned. This is a native I've personally been searching for for a while.