Fix up titles of TRPL chapters

Author: steveklabnik

src/doc/trpl/crates-and-modules.md

@@ -1,4 +1,4 @@
-% The Rust Crates and Modules Guide
+% Crates and Modules
 
 When a project starts getting large, it's considered a good software
 engineering practice to split it up into a bunch of smaller pieces, and then

src/doc/trpl/error-handling.md

@@ -1,4 +1,4 @@
-% Error Handling in Rust
+% Error Handling
 
 > The best-laid plans of mice and men  
 > Often go awry

src/doc/trpl/ffi.md

@@ -1,4 +1,4 @@
-% The Rust Foreign Function Interface Guide
+% Foreign Function Interface
 
 # Introduction
 

src/doc/trpl/macros.md

@@ -1,4 +1,4 @@
-% The Rust Macros Guide
+% Macros
 
 # Introduction
 

src/doc/trpl/ownership.md

@@ -1,4 +1,4 @@
-% The Rust Ownership Guide
+% Ownership
 
 This guide presents Rust's ownership system. This is one of Rust's most unique
 and compelling features, with which Rust developers should become quite

src/doc/trpl/plugins.md

@@ -1,4 +1,4 @@
-% The Rust Compiler Plugins Guide
+% Compiler Plugins
 
 <div class="unstable-feature">
 

src/doc/trpl/pointers.md

@@ -1,4 +1,4 @@
-% The Rust Pointer Guide
+% Pointers
 
 Rust's pointers are one of its more unique and compelling features. Pointers
 are also one of the more confusing topics for newcomers to Rust. They can also

src/doc/trpl/testing.md

@@ -1,4 +1,4 @@
-% The Rust Testing Guide
+% Testing
 
 > Program testing can be a very effective way to show the presence of bugs, but
 > it is hopelessly inadequate for showing their absence. 

src/doc/trpl/unsafe.md

@@ -1,4 +1,4 @@
-% Writing Unsafe and Low-Level Code in Rust
+% Unsafe and Low-Level Code
 
 # Introduction
 

src/doc/trpl/variable-bindings.md

@@ -1,4 +1,4 @@
-% Variable bindings
+% Variable Bindings
 
 The first thing we'll learn about are *variable bindings*. They look like this: