lsp-rust: remove redundant `lsp-interface' comment

`lsp-interface' wasn't designed to destructure lists; stating that fact
before `lsp-rust--analyzer-show-references' is as such redundant, since
that is normal and not noteworthy.

Author: nbfalcon

clients/lsp-rust.el

@@ -585,8 +585,6 @@ The command should include `--message=format=json` or similar option."
 (lsp-defun lsp-rust--analyzer-run-single ((&Command :arguments?))
   (lsp-rust-analyzer-run (lsp-seq-first arguments?)))
 
-;; `lsp-interface' is unsuitable for ShowReference destructuring, as that code
-;; action yields an array of three elements, not a map.
 (lsp-defun lsp-rust--analyzer-show-references
   ((&Command :title :arguments? [_uri _filepos references]))
   (lsp-show-xrefs (lsp--locations-to-xref-items references) nil