Expand packages and raw Engine write-up.

doc/src/SUMMARY.md

@@ -23,7 +23,7 @@ The Rhai Scripting Language
    1. [Hello World in Rhai - Evaluate a Script](engine/hello-world.md)
    2. [Compile to AST for Repeated Evaluations](engine/compile.md)
    3. [Call a Rhai Function from Rust](engine/call-fn.md)
-   4. [Create a Rust Anonymous Function from a Rhai Function](engine/func.md)
+   4. [Create a Rust Closure from a Rhai Function](engine/func.md)
    5. [Evaluate Expressions Only](engine/expressions.md)
    6. [Raw Engine](engine/raw.md)
 4. [Extend Rhai with Rust](rust/index.md)
@@ -106,6 +106,7 @@ The Rhai Scripting Language
       2. [Loadable Configuration](patterns/config.md)
       3. [Control Layer](patterns/control.md)
       4. [Singleton Command](patterns/singleton.md)
+      5. [One Engine Instance Per Call](patterns/parallel.md)
    2. [Capture Scope for Function Call](language/fn-capture.md)
    3. [Serialization/Deserialization of `Dynamic` with `serde`](rust/serde.md)
    4. [Script Optimization](engine/optimize/index.md)