update number.md

docs/uts/buildin-object-api/number.md

@@ -136,4 +136,15 @@ console.log(a.toLong());
 
 <!-- UTSJSON.Number.toULong.returnValue -->
 
-<!-- UTSJSON.Number.toULong.compatibility -->
\ No newline at end of file
+<!-- UTSJSON.Number.toULong.compatibility -->
+
+
+### from()
+
+<!-- UTSJSON.Number.from.description -->
+
+<!-- UTSJSON.Number.from.param -->
+
+<!-- UTSJSON.Number.from.returnValue -->
+
+<!-- UTSJSON.Number.from.compatibility -->
\ No newline at end of file