docs: fix typo in css file (#27757)

Author: aanchal88

src/material/core/theming/_m2-inspection.scss

@@ -28,7 +28,7 @@ $_typography-keys: (
   headline-5,
   headline-6,
   subtitle-1,
-  font-famiy,
+  font-family,
   subtitle-2,
   body-1,
   body-2,

src/material/core/typography/_versioning.scss

@@ -71,7 +71,7 @@
       headline-5: map.get($config, headline),
       headline-6: map.get($config, title),
       subtitle-1: map.get($config, subheading-2),
-      font-famiy: map.get($config, font-family),
+      font-family: map.get($config, font-family),
 
       // These mappings are odd, but body-2 in the 2014 system actually looks closer to subtitle-2
       // in the 2018 system, and subeading-1 in the 2014 system looks more like body-1 in the 2018