Update docs and changelog

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [Unreleased]
 ### Added
 - Fallback images.
+- [padding](./docs/generating_the_url_advanced.md#padding) processing option.
 
 ## [2.12.0] - 2020-04-07
 ### Addded

docs/generating_the_url_advanced.md

@@ -184,9 +184,9 @@ Defines padding size in css manner. All arguments are optional but at least one
 * `bottom` - bottom padding;
 * `left` - left padding.
 
-**📝Notes:** 
-* Padding is applied after all image transformations (except watermark) and enlarges generated image which means that if your resize dimensions were 100x200px and you applied `padding:10` option then you will get 120x220px image.
-* Padding follows [dpr](#dpr) option so it will be scaled too if you set it.
+**📝Note:** Padding is applied after all image transformations (except watermark) and enlarges generated image which means that if your resize dimensions were 100x200px and you applied `padding:10` option then you will get 120x220px image.
+
+**📝Note:** Padding follows [dpr](#dpr) option so it will be scaled too if you set it.
 
 #### Trim