naming cleanup in math routines

c64/basic/,stubs_math/bf71.sqr_FAC1.s

@@ -0,0 +1,20 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+//
+// Math package - square root of FAC1
+//
+// Note:
+// - transfers FAC1 to FAC2 and falls through to SQR2
+//
+// See also:
+// - [CM64] Computes Mapping the Commodore 64 - page 117
+// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
+// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
+//
+
+// XXX provide implementation
+
+sqr_FAC1:
+	STUB_IMPLEMENTATION()