buildroot

docs/website: add a space between attributes

Error highlighted by the W3 HTML validator:

Error: No space between attributes.
At line 71, column 64
e="width:100%;"href="/download

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>