Use "large" and "small" instead of "lg" and "sm", and remove deprecation of -large button modifier

Author: tobiasahlin

deprecations.js

@@ -79,10 +79,6 @@ const versionDeprecations = {
       selectors: ['.bg-shade-gradient'],
       message: `This selector is deprecated, please use "color-bg-secondary" instead of "bg-shade-gradient".`
     },
-    {
-      selectors: ['.btn-large-mktg'],
-      message: `Please use the ".btn-lg-mktg" class instead of "btn-large-mktg".`
-    },
     {
       selectors: ['.color-border-overlay'],
       message: `Please use the ".color-border-primary" class instead of ".color-border-overlay".`

src/marketing/buttons/button.scss

@@ -95,12 +95,12 @@
 
 // Size modifiers
 
-.btn-sm-mktg {
+.btn-small-mktg {
   // stylelint-disable-next-line primer/spacing
   padding: rem(10px) rem($spacer-3) rem(13px);
 }
 
-.btn-lg-mktg {
+.btn-large-mktg {
   // stylelint-disable-next-line primer/spacing
   padding: 20px 30px 23px !important;
 }