Distinguish simple vs parameterized predefined types on cheat sheet

The flat list was causing AI tools to use parameterized types like
Currency without their required arguments. Now lists all simple
predefined types separately from parameterized ones, with each
parameterized type showing its required arguments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: reid-spencer

docs/riddl/references/cheat-sheet.md

@@ -310,9 +310,20 @@ messages, states, and parameters in RIDDL.
 - **Alternation** (union): `type X is one of { T1, T2, T3 }`
 - **Enumeration**: `type X is any of { A, B, C }`
 - **Collection**: `many T`, `set of T`, `mapping from K to V`, `T?`
-- **Pattern**: `Pattern("regex")`
-- **Predefined**: `String`, `Integer`, `Boolean`, `UUID`, `Date`,
-  `DateTime`, `Duration`, `URL`, `Currency`, `Decimal`, etc.
+- **Simple predefined types** — use the name alone, no parameters:
+  `Abstract`, `Nothing`, `Boolean`, `Current`, `Date`, `DateTime`,
+  `Duration`, `Length`, `Luminosity`, `Mass`, `Mole`, `Number`,
+  `String`, `Temperature`, `Time`, `TimeStamp`, `UUID`
+- **Parameterized predefined types** — **require parenthesized
+  arguments**; using these without parameters is invalid:
+    - `String(min, max, enc)` — constrained string
+    - `Id(entity)` — unique identifier for an entity type
+    - `URL(scheme)` — URL with a specific scheme
+    - `Range(min, max)` — bounded integer range
+    - `LatLong(lat, long)` — geographic coordinates
+    - `Currency(country-code)` — monetary amount
+      (e.g., `Currency(USD)`)
+    - `Pattern(regex)` — string matching a regular expression
 
 > *[For more details →](../concepts/type.md)*