book: Fix broken link to unsafe chapter

diwic · diwic · commit d2d889842392 · 2015-04-26T20:32:14.000+02:00
diff --git a/src/doc/trpl/const-and-static.md b/src/doc/trpl/const-and-static.md
@@ -66,6 +66,8 @@ unsafe {
 }
 ```
 
+[unsafe]: unsafe.html
+
 Furthermore, any type stored in a `static` must be `Sync`.
 
 # Initializing

Original file line number	Diff line number	Diff line change
`@@ -66,6 +66,8 @@ unsafe {`
`66`	`66`	`}`
`67`	`67`	```
`68`	`68`
	`69`	`+[unsafe]: unsafe.html`
	`70`	`+`
`69`	`71`	Furthermore, any type stored in a `static` must be `Sync`.
`70`	`72`
`71`	`73`	`# Initializing`