cleanup, docs

site/doc/pages/2_DValue_to_u64.txt

@@ -6,12 +6,14 @@ u64 : fallback returned when conversion is not possible
 return value : converted value or the fallback
 
 :see
+>types
 0_DValue
 2_DValue_get_by_path
 
 :content
 Converts strings, f64, bool, pointer, and single-value maps to an unsigned integer. Invalid or empty strings return the default. Negative values clamp to zero and oversized values clamp to `u64` max.
 
-```cpp
-u64 id = row["id"].to_u64();
-```
+:example
+DValue value;
+value = "42";
+print(value.to_u64(), "\n");