Use underscores in names when applicable.

Author: sarahelsaig

Lombiq.HelpfulExtensions/Extensions/Liquid/Readme.md

@@ -4,9 +4,10 @@ Adds various Liquid tags and filters. For more information about Liquid in Orcha
 
 ## Tags
 
-- `{% ifnotempty condition %)`: Evaluates `condition` and if it's not a falsey value, converts the result to string. The statements inside this block are evaluated if the aforementioned string result is not `null`, empty or whitespace.
-- `{% assignarray 'name', 'value1', 'value2', 'etc' %}`: Assigns a new array type variable with the provided name and arbitrary initial values. You can also type `{% assignarray 'name' %}` to create an empty array that you can fill up using a loop.
+- `{% ifnotempty condition %)...{% endifnotempty %}`: Evaluates `condition` and if it's not a falsey value, converts the result to string. The statements inside this block are evaluated if the aforementioned string result is not `null`, empty or whitespace.
+- `{% assign_array 'name', 'value1', 'value2', 'etc' %}`: Assigns a new array type variable with the provided name and arbitrary initial values. You can also type `{% assign_array 'name' %}` to create an empty array that you can fill up using a loop.
+- 
 
 ## Filters
 
-- `isnotempty`: Returns `true` if the input is not null and not empty.
+- `is_not_empty`: Returns `true` if the input is not null and not empty.

Lombiq.HelpfulExtensions/Extensions/Liquid/Startup.cs

@@ -10,7 +10,7 @@ public sealed class Startup : StartupBase
     public override void ConfigureServices(IServiceCollection services)
     {
         services.AddLiquidParserBlock<IfNotEmptyParserBlock>("ifnotempty");
-        services.AddLiquidFilter<IsNotEmptyFilter>("isnotempty");
-        services.AddLiquidParserTag<AssignArrayParserBlock>("assignarray");
+        services.AddLiquidFilter<IsNotEmptyFilter>("is_not_empty");
+        services.AddLiquidParserTag<AssignArrayParserBlock>("assign_array");
     }
 }