Added a link address to Vectors page of the book

At https://doc.rust-lang.org/book/vectors.html, there should be a link to
Generics page but the link address is ommitted and thus link is not functioning
well. So I added a link definition to the vectors.md.

r? @steveklabnik

diff --git a/src/doc/trpl/vectors.md b/src/doc/trpl/vectors.md
index 965cb218c699a1ecec1a4d5a2ed3dc9b675a9b21..28d815c4eb735fdb5ba8b78b5b400051f5082c30 100644 (file)
--- a/src/doc/trpl/vectors.md
+++ b/src/doc/trpl/vectors.md
@@ -56,3 +56,4 @@ Vectors have many more useful methods, which you can read about in [their
 API documentation][vec].
 
 [vec]: ../std/vec/index.html
+[generic]: generics.html