docs: Improve MemoryTemporaryStorage documentation

[GarmashAlex]

Please add the labels corresponding to the type of changes your PR introduces:

• [+] Documentation (YES)

Description

• Add comprehensive documentation for MemoryTemporaryStorage struct explaining its purpose and behavior
• Document remove() method with clear description of its return value
• Document take() method with explanation of its functionality and return behavior
• Fix missing documentation for core storage operations

Related Issues

N/A

Testing Performed

DOCUMENTATION

Checklist

• I have performed a self-review of my own code.
• The tests pass successfully with cargo test.
• The code was formatted with cargo fmt.
• The code compiles with no new warnings with cargo build --release and cargo build --release --features runtime-benchmarks.
• The code has no new warnings when using cargo clippy.
• If this change affects documented features or needs new documentation, I have created a PR with a documentation update.