Rollup merge of #67394 - matthew-healy:update-libsyntax-ptr-docs, r=Dylan-DPC
Rollup merge of #67394 - matthew-healy:update-libsyntax-ptr-docs, r=Dylan-DPC

Remove outdated references to @T from comments

Closes #67341.

This removes all references to `@T` from the comment in libsyntax/ptr.rs.

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