Add missing [package.description] for 'syntax-bridge' crate

Author: regexident

src/tools/rust-analyzer/crates/syntax-bridge/Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "syntax-bridge"
 version = "0.0.0"
-description = "TBD"
 repository.workspace = true
+description = "Conversions between syntax nodes and token trees for rust-analyzer."
 
 authors.workspace = true
 edition.workspace = true