Rollup merge of #153647 - TKanX:docs/153618-file-lock-cross-process, r=Mark-Simulacrum

docs(fs): Clarify That File::lock Coordinates Across Processes

### Summary:

The documentation for `lock`, `lock_shared`, `try_lock`, and `try_lock_shared` did not make it clear that these are OS level file locks that coordinate access across processes, not just between handles within the current process.

Add "in this or any other process" to each method's existing description to clarify this.

Fixes rust-lang/rust#153618

r? @Mark-Simulacrum

Author: JonathanBrouwer