Add language and examples to describe how to use the configuration op…

…tions. (#8249)

Merge pull request 8249

docs/_docs/configuration/liquid.md

@@ -9,10 +9,28 @@ options are
 - `warn` --- Output a warning on the console for each error.
 - `strict` --- Output an error message and stop the build.
 
+Within _config.yml, this could be configured as follows:
+
+```yaml
+liquid:
+  error_mode: warn
+```
+
 You can also configure Liquid's renderer to catch non-assigned variables and
 non-existing filters by setting `strict_variables` and / or `strict_filters`
 to `true` respectively. {% include docs_version_badge.html version="3.8.0" %}
 
 Do note that while `error_mode` configures Liquid's parser, the `strict_variables`
 and `strict_filters` options configure Liquid's renderer and are consequently,
 mutually exclusive.
+
+An example of setting these variables within _config.yml is as follows:
+
+```yaml
+liquid:
+  error_mode strict
+  strict_variables: true
+  strict_filters: true
+```
+
+Configuring as described above will stop a build/serve from happening and instead call out the offending error and halt. This is helpful when desiring to catch liquid-related issues by stopping the build or serve process and forcing you to deal with it.