Docs improvements

[petermorlion]

I had a tiny bit of trouble reading the overview of caching providers to see what was need for me to use this library. I quickly got it, but noticed some small improvements could be made. Hope you like them.

[what-the-diff]

PR Summary

• Enhanced Cache Provider Information
  The PR provides new sections detailing various cache providers and how they can be utilized effectively.

• Detailed Instructions for EasyCaching.Core
  There are now improved guidelines and clarifications for using EasyCaching.Core as the preferred cache provider.

• Guidelines for using CacheManager.Core
  New, comprehensive instructions and configuration setups have been introduced for CacheManager.Core cache provider usage.

• Introduction to custom cache providers
  Information on how to use and exploit custom cache providers have been added, giving users more flexibility.

• Global Cache Setting Enhancements
  Instructions and configurations for setting up global cache settings have been refined for better comprehension and functionality.

• Caching Specific Commands and Queries
  This update also brings instructions and configurations for caching specific queries and commands, optimizing performance.

• Skipping Caching and Cache Invalidation
  The PR adds detail on how to skip caching and to invalidate cache when required, aiding overall cache management.

• .DisableLogging() Usage Update
  Updates on how .DisableLogging() method has been used in some configurations are part of the PR. This change ensures appropriate management of logging activities within the system.

[VahidN]

Thanks.