[Doc] Updated API Compatibility documentation with latest info

[Vijay-Nirmal]

• Updated API Compatibility doc with missed out commands
• Add documentation for already existing commands but not documented
• Updated comments in API Compatibility doc to indicate if there is anything missing

Open Question:

1. Should I add commands from the Redis module in API Compatibility doc? Note: ICYMI, Redis 8 will add most modules to the base image itself.

[badrishc]

Should I add commands from the Redis module in API Compatibility doc?

Thanks for your contributions! There is no need to list modules in there at this point, IMO. We can revisit that later.

[tmikaeld]

ZREVRANGEBYSCORE was also completed.

[Vijay-Nirmal]

@tmikaeld Thanks for letting me know, updated it as part of this PR

[badrishc]

i don't think Garnet has support for the LOLWUT command. Need to remove here and the description section for it.

[Vijay-Nirmal]

@badrishc My bad. I had noted down in my notes wrongly. It was supposed to be MONITOR (command below LOLWUT), which was already implemented. I have made the changes accordingly.