auto merge of #11350 : kchmck/rust/fix-pdf-glitches, r=alexcrichton

I was reading through the tutorial and manual pdfs and noticed some of the code blocks have glitches in their formatting:

![](http://i.imgur.com/9HXZ4dW.png)
![](http://i.imgur.com/Ds2By6j.png)

Putting empty lines around the blocks fixes this. I did a search through the other markdown files and made the change there as well.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/tutorial.md b/doc/tutorial.md
index 2f017c77c0b..067282c12cd 100644
--- a/doc/tutorial.md
+++ b/doc/tutorial.md
@@ -2790,6 +2790,7 @@ For example, if we move the `animals` module above into its own file...
 mod plants;
 mod animals;
 ~~~
+
 ~~~ {.ignore}
 // src/animals.rs or src/animals/mod.rs
 mod fish;
@@ -2797,6 +2798,7 @@ mod mammals {
     mod humans;
 }
 ~~~
+
 ...then the source files of `mod animals`'s submodules can
 either be placed right next to that of its parents, or in a subdirectory if `animals` source file is:
 
@@ -2959,6 +2961,7 @@ pub fn bar() { println("Baz!"); }
 There also exist two short forms for importing multiple names at once:
 
 1. Explicit mention multiple names as the last element of an `use` path:
+
 ~~~
 use farm::{chicken, cow};
 # mod farm {
@@ -2969,6 +2972,7 @@ use farm::{chicken, cow};
 ~~~
 
 2. Import everything in a module with a wildcard:
+
 ~~~
 use farm::*;
 # mod farm {