Fix typos in layout docs

[lvivier]

closes #141

contstruct -> construct
variedy -> variety

[sebastienbarre]

Thanks @lvivier! However this is not the right file. The docs directory is "built" (we should rename it to build one day), and your fix would be erase the next time it is built. The file you are looking for is src/templates/docs/grid/index.html

[lvivier]

@sebastienbarre haha wow, embarrassing. Did not occur to me to read the readme of course! Think this should be right now.

[johno]

Thanks!