Make table text the same size as body text. Add styles to support table reformatting.

BUG=none
R= mkearney@chromium.org, smain@chromium.org, binji@chromium.org, binji@google.com, kalman@chromium.org
TEST=none
NOTRY=true
(documentation only change)

Review URL: https://codereview.chromium.org/483163002

Cr-Commit-Position: refs/heads/master@{#292305}

chrome/common/extensions/docs/static/sass/_typography.scss

@@ -114,6 +114,18 @@ footer[role="contentinfo"] {
   }
 }
 
+table {
+  font-size: $body-font-size;
+}
+
+td dl {
+  margin: 0.4em 0;
+}
+
+td dt {
+  margin: 0 0 0.4em 0;
+}
+
 em {
   padding-right: 2px; /* "kerning" adjustment */
 }