Fixing Wheezy link

Signed-off-by: Quentin Tayssier <qtayssier@gmail.com>

docs/installation/debian.md

@@ -13,7 +13,7 @@ parent = "smn_linux"
 Docker is supported on the following versions of Debian:
 
  - [*Debian 8.0 Jessie (64-bit)*](#debian-jessie-80-64-bit)
- - [*Debian 7.7 Wheezy (64-bit)*](#debian-wheezystable-7x-64-bit)
+ - [*Debian 7.7 Wheezy (64-bit)*](#debian-wheezy-stable-7-x-64-bit)
 
 ## Debian Jessie 8.0 (64-bit)