Rollup merge of #82857 - pierwill:edit-ast-lowering-lib, r=Dylan-DPC
Rollup merge of #82857 - pierwill:edit-ast-lowering-lib, r=Dylan-DPC

Edit ructc_ast_lowering docs

Fixes some punctuation and formatting; also makes some small wording changes.

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