clean up wording/grammar and mention double quotes

Author: lolbinarycat

src/doc/rustc-dev-guide/src/SUMMARY.md

@@ -95,7 +95,7 @@
 - [Parallel Compilation](./parallel-rustc.md)
 - [Rustdoc internals](./rustdoc-internals.md)
     - [Search](./rustdoc-internals/search.md)
-	- [the `rustdoc` test suite](./rustdoc-internals/rustdoc-test-suite.md)
+	- [The `rustdoc` test suite](./rustdoc-internals/rustdoc-test-suite.md)
 # Source Code Representation
 
 - [Prologue](./part-3-intro.md)

src/doc/rustc-dev-guide/src/rustdoc-internals/rustdoc-test-suite.md

@@ -1,6 +1,6 @@
-# the `rustdoc` test suite
+# The `rustdoc` test suite
 
-This page is specifically about the `rustdoc` test suite, for other test suites used for testing rustdoc, see [Rustdoc § Tests](../rustdoc.md#tests).
+This page is specifically about the test suite named `rustdoc`, for other test suites used for testing rustdoc, see [Rustdoc Tests](../rustdoc.md#tests).
 
 The `rustdoc` test suite is specifically used to test the HTML output of rustdoc.
 
@@ -20,7 +20,8 @@ so it is conventional to use a `#![crate_name = "foo"]` attribute to avoid
 having to write a long crate name multiple times.
 To avoid repetion, `-` can be used in any `PATH` argument to re-use the previous `PATH` argument.
 
-All arguments take the form of quoted strings,
+All arguments take the form of quoted strings
+(both single and double quotes are supported),
 with the exception of `COUNT` and the special `-` form of `PATH`.
 
 Directives are assertions that place constraints on the generated HTML.