📝 Add merge default rule examples

docs/options/merge-default-rules.md

@@ -2,8 +2,94 @@
 
 Option `merge-default-rules` will determine whether the rules present in a user's external configuration file or passed directly in to Sass Lint will override or merge with the default rules present in Sass Lint. All other configuration options will still be merged.
 
-If an external configuration file has `merge-default-rules` set to `false`, its rules will override the default rules, but rules passed directly in to Sass Lint will be merged with the configuration file rules (unless they, to have `merge-default-rules` set to `false`, in which case they will override).
+If an external configuration file has `merge-default-rules` set to `false`, its rules will override the default rules, but rules passed directly in to Sass Lint will be merged with the configuration file rules (unless they too have `merge-default-rules` set to `false`, in which case they will override).
 
 ## Options
 
 * `true`/`false` (defaults to `true`)
+
+## Examples
+
+Below is a sample of sass-lints default rules. You can see the full default ruleset [here](https://github.com/sasstools/sass-lint/blob/develop/lib/config/sass-lint.yml).
+
+```yml
+options:
+  formatter: stylish
+files:
+  include: '**/*.s+(a|c)ss'
+rules:
+  # Extends
+  extends-before-mixins: 1
+  extends-before-declarations: 1
+  placeholder-in-extend: 1
+
+  # Mixins
+  mixins-before-declarations: 1
+  no-color-literals: 0
+
+  ~~~
+```
+
+Below is a default user configured ruleset containing only one rule with `merge-default-rules: true`
+
+```yml
+options:
+  formatter: stylish
+  merge-default-rules: true
+files:
+  include: '**/*.s+(a|c)ss'
+rules:
+
+  no-color-literals: 1
+```
+
+With `merge-default-rules: true` the rules applied to the linter would be as follows. Notice that `no-color-literals` is now set to `1` and the default ruleset has been merged with our user config
+
+```yml
+options:
+  formatter: stylish
+  merge-default-rules: true
+
+files:
+  include: '**/*.s+(a|c)ss'
+rules:
+  # Extends
+  extends-before-mixins: 1
+  extends-before-declarations: 1
+  placeholder-in-extend: 1
+
+  # Mixins
+  mixins-before-declarations: 1
+  no-color-literals: 1
+
+  ~~~
+```
+
+Below is a default user configured ruleset containing only one rule with `merge-default-rules: false`
+
+```yml
+options:
+  formatter: stylish
+  merge-default-rules: false
+files:
+  include: '**/*.s+(a|c)ss'
+rules:
+
+  no-color-literals: 1
+```
+
+With `merge-default-rules: false` the rules applied to the linter would be as follows. Notice that `no-color-literals` is now set to `1` but rules not present in the user configuration are not merged.
+
+```yml
+options:
+  formatter: stylish
+  merge-default-rules: false
+
+files:
+  include: '**/*.s+(a|c)ss'
+rules:
+
+  no-color-literals: 1
+
+  ~~~
+```