Fix incorrect number of top level token trees in source-analysis

src/macros/syntax/source-analysys.md

@@ -99,7 +99,7 @@ would be parsed into the following token trees:
 ```
 
 Note that this has *no relationship* to the AST the expression would produce; instead of a single
-root node, there are *nine* token trees at the root level. For reference, the AST would be:
+root node, there are *seven* token trees at the root level. For reference, the AST would be:
 
 ```text
               ┌─────────┐
@@ -138,4 +138,4 @@ nor is it possible to have incorrectly nested groups in a token tree.
 [`rustc_lexer`]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_lexer
 [`rustc_parse`]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_parse
 [lexer]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_parse/src/lexer
-[Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
+[Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree