Rollup merge of #64042 - juliangehring:string-docs, r=jonas-schievink
Rollup merge of #64042 - juliangehring:string-docs, r=jonas-schievink

Fix word repetition in str documentation

Fixes a few repetitions of "like like" in the `trim*` methods documentation of `str`.

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust