manual: Fix hobby curve's style description

manual.typ

@@ -69,7 +69,7 @@ Many CeTZ functions expect data in certain formats which we will call types. Not
   / `<coordinate>`: Any coordinate system. See coordinate-systems.
   / `<number>`: Any of `<float>`, `<integer>` or `<length>`. 
   / `<style>`: Named arguments (or a dictionary if used for a single argument) of style key-values.
-  / `<context>`: An opaque CeTZ context object that holds internal state.
+  / `<context>`: An CeTZ context object that holds internal state.
 
 == Anchors <anchors>
 Anchors positions relative to named elements. To use an anchor of an element, you must give the element a name using the `name` argument. All elements with the `name` argument allow anchors.

src/draw/shapes.typ

@@ -1399,8 +1399,8 @@
 /// *Root* `hobby`
 /// == Keys
 ///   Supports marks.
-///   #show-parameter-block("omega", "idk", [The curve's curlyness])
-///   #show-parameter-block("rho", "idk", [])
+///   #show-parameter-block("omega", "float", [The curve's curlyness])
+///   #show-parameter-block("rho", "auto,function", [The $rho$ function of the form `(a, b) => float`])
 ///
 /// = Anchors
 ///   Supports distance anchors.