Resolve Typo

Corrected the spelling of individually from individualy on line no. 364.

Author: prashant-645

lib/web/css/docs/source/_layout.less

@@ -361,7 +361,7 @@ footer.footer {
 
 //  # Layout width
 //
-//  The <code>.lib-layout-width()</code> mixin is used to set default page width of the element the mixin is applied to. It can be used to set width for the whole page wrapper or for the page elements individualy like header, footer, and so on.
+//  The <code>.lib-layout-width()</code> mixin is used to set default page width of the element the mixin is applied to. It can be used to set width for the whole page wrapper or for the page elements individually like header, footer, and so on.
 
 //  # Layout width variables
 //