minor edits

src/syntax-intro.md

@@ -1,19 +1,18 @@
 # Syntax and the AST
 
-Working directly with source code is very inconvenient and error-prone. Thus,
-before we do anything else, we convert raw source code into an [Abstract Syntax
-Tree (`AST`)][`AST`]. It turns out that doing even this involves a lot of work,
-including [lexing, parsing], [`macro` expansion], [name resolution], conditional
-compilation, [feature-gate checking], and [validation] of the [`AST`]. In this chapter,
-we take a look at all of these steps.
+Working directly with source code is very inconvenient and error-prone.
+Thus, before we do anything else, we convert raw source code into an
+[Abstract Syntax Tree (AST)][AST]. It turns out that doing this involves a lot of work,
+including [lexing, parsing], [macro expansion], [name resolution], conditional
+compilation, [feature-gate checking], and [validation] of the [AST].
+In this chapter, we take a look at all of these steps.
 
-Notably, there isn't always a clean ordering between these tasks. For example,
-`macro` expansion relies on name resolution to resolve the names of `macro`s and
-imports. And parsing requires `macro` expansion, which in turn may require
-parsing the output of the `macro`.
+Notably, there isn't always a clean ordering between these tasks.
+For example, macro expansion relies on name resolution to resolve the names of macros and imports.
+And parsing requires macro expansion, which in turn may require parsing the output of the macro.
 
-[`AST`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/index.html
-[`macro` expansion]: ./macro-expansion.md
+[AST]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/index.html
+[macro expansion]: ./macro-expansion.md
 [feature-gate checking]: ./feature-gate-ck.md
 [lexing, parsing]: ./lexing-parsing.md
 [name resolution]: ./name-resolution.md