Rollup merge of #67181 - TheSamsa:update-hashmap-doc, r=Dylan-DPC
Rollup merge of #67181 - TheSamsa:update-hashmap-doc, r=Dylan-DPC

Update hashmap doc

Update hint to the used algorithms. Skimmed over the longer description but could not find another mentioning of the old algorithms.

Closes #67093

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