Make chapter links in compiletest not be code

mdBook doesn't display links inside code, so these links look very confusing.
Additionally, these types of links don't seem to be code on other pages of the book.

src/compiletest.md

@@ -13,7 +13,7 @@ cases, even failure to compile.  Tests are typically organized as a Rust source
 file with annotations in comments before and/or within the test code, which
 serve to direct `compiletest` on if or how to run the test, what behavior to
 expect, and more.  If you are unfamiliar with the compiler testing framework,
-see [`this chapter`](./tests/intro.html) for additional background.
+see [this chapter](./tests/intro.html) for additional background.
 
 The tests themselves are typically (but not always) organized into
 "suites"--for example, `run-pass`, a folder representing tests that should
@@ -22,8 +22,8 @@ but return a failure (non-zero status), `compile-fail`, a folder holding tests
 that should fail to compile, and many more.  The various suites are defined in
 [src/tools/compiletest/src/common.rs][common] in the `pub struct Config`
 declaration.  And a very good introduction to the different suites of compiler
-tests along with details about them can be found in [`Adding new
-tests`](./tests/adding.html).
+tests along with details about them can be found in [Adding new
+tests](./tests/adding.html).
 
 ## Adding a new test file