Added Fallible System Params

Cargo.toml

@@ -1079,6 +1079,16 @@ description = "Shows how to iterate over combinations of query results"
 category = "ECS (Entity Component System)"
 wasm = true
 
+[[example]]
+name = "optional_system_param"
+path = "examples/ecs/optional_system_param.rs"
+
+[package.metadata.example.optional_system_param]
+name = "Optional System Parameter"
+description = "Provides an advanced pattern for working with trait object resources via `OptionalSystemParam`"
+category = "ECS (Entity Component System)"
+wasm = false
+
 [[example]]
 name = "parallel_query"
 path = "examples/ecs/parallel_query.rs"
@@ -1099,6 +1109,16 @@ description = "Query for entities that had a specific component removed earlier
 category = "ECS (Entity Component System)"
 wasm = false
 
+[[example]]
+name = "resultful_system_param"
+path = "examples/ecs/resultful_system_param.rs"
+
+[package.metadata.example.resultful_system_param]
+name = "Resultful System Parameter"
+description = "Provides an advanced pattern for encapsulating simple behavior with `ResultfulSystemParam`"
+category = "ECS (Entity Component System)"
+wasm = false
+
 [[example]]
 name = "run_conditions"
 path = "examples/ecs/run_conditions.rs"