Update fonts

Author: Laess3r

projects/material-addons/src/themes/common/theme.scss

@@ -8,7 +8,7 @@ $default-palette: undefined;
 $is-dark-theme: undefined;
 
 $typography: mat.m2-define-typography-config(
-  $font-family: 'Roboto, Helvetica Neue, sans-serif',
+  $font-family: 'Roboto, sans-serif',
 );
 
 @function build-custom-theme($theme-name, $primary-palette, $default-colors, $warn-palette: mat.$m2-red-palette) {

src/app/component-demos/alert-demo/alert-demo-api-spec/alert-demo-api-spec.component.scss

@@ -1,5 +1,5 @@
 .api-specification {
-  font-family: Arial, sans-serif;
+  font-family: sans-serif;
 }
 
 .api-specification h2 {

src/app/component-demos/upload-demo/upload-demo-api-spec/upload-demo-api-spec.component.scss

@@ -1,5 +1,5 @@
 .api-specification {
-  font-family: Arial, sans-serif;
+  font-family: sans-serif;
 }
 
 .api-specification h2 {