Rollup merge of #73847 - pierwill:pierwill-cursor-doc, r=matthewjasper
Rollup merge of #73847 - pierwill:pierwill-cursor-doc, r=matthewjasper

Edit cursor.prev() method docs in lexer

Fix missing punctuation

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