Minor symbol comment fixes.

- The empty symbol is no longer a keyword.
- I don't think any of the special reserved identifiers are used for
  error recovery.

Author: nnethercote

compiler/rustc_span/src/symbol.rs

@@ -21,18 +21,17 @@ mod tests;
 
 // The proc macro code for this is in `compiler/rustc_macros/src/symbols.rs`.
 symbols! {
-    // This list includes things that are definitely keywords (e.g. `if`),
-    // a few things that are definitely not keywords (e.g. the empty symbol,
-    // `{{root}}`) and things where there is disagreement between people and/or
-    // documents (such as the Rust Reference) about whether it is a keyword
-    // (e.g. `_`).
+    // This list includes things that are definitely keywords (e.g. `if`), a
+    // few things that are definitely not keywords (e.g. `{{root}}`) and things
+    // where there is disagreement between people and/or documents (such as the
+    // Rust Reference) about whether it is a keyword (e.g. `_`).
     //
     // If you modify this list, adjust any relevant `Symbol::{is,can_be}_*`
     // predicates and `used_keywords`. Also consider adding new keywords to the
     // `ui/parser/raw/raw-idents.rs` test.
     Keywords {
-        // Special reserved identifiers used internally for elided lifetimes,
-        // unnamed method parameters, crate root module, error recovery etc.
+        // Special reserved identifiers used internally for unnamed method
+        // parameters, crate root module, etc.
         // Matching predicates: `is_special`/`is_reserved`
         //
         // tidy-alphabetical-start