fix: update FSQRT function doc

docs/library/fsqrt.bas.md

@@ -3,7 +3,7 @@
 ##fSqrt
 
 ZX BASIC uses the ZX Spectrum ROM routine to calculate many of the floating point math functions.
-Unfortunately, some of the functions are notoriously slow. Square root being one of them - 
+Unfortunately, some of the functions are notoriously slow. Square root being one of them -
 there wasn't enough space in the original ROM design to do a good routine, so they cheated.
 They calculate x<sup>0.5</sup> instead, and roll straight into the exponent routine.
 It turns out that though this works, it's exceptionally slow.
@@ -22,21 +22,23 @@ REM By Britlion
 
 FUNCTION FASTCALL fSqrt (radicand as FLOAT) as FLOAT
 ASM
+        push namespace core
+
         ; FLOAT value arrives in A ED CB
         ; A is the exponent.
-          AND   A               ; Test for zero argument 
+          AND   A               ; Test for zero argument
           RET   Z               ; Return with zero.
-          
+
           ;Strictly we should test the number for being negative and quit if it is.
           ;But let's assume we like imaginary numbers, hmm?
           ; If you'd rather break it change to a jump to an error below.
           ;BIT   7,E          ; Test the bit.
-          ;JR    NZ,REPORT       ; back to REPORT_A 
+          ;JR    NZ,REPORT       ; back to REPORT_A
                                 ; 'Invalid argument'
           RES 7,E               ; Now it's a positive number, no matter what.
-          
+
           call __FPSTACK_PUSH   ; Okay, We put it on the calc stack. Stack contains ABS(x)
-                    
+
           ;   Halve the exponent to achieve a good guess.(accurate with .25 16 64 etc.)
 
                                 ; Remember, A is the exponent.
@@ -50,32 +52,34 @@ ASM
 ASIS:     XOR   $80             ; restore sign.
           call __FPSTACK_PUSH   ; Okay, NOW we put the guess on the stack
           rst  28h   ; ROM CALC    ;;guess,x
-          DEFB $C3              ;;st-mem-3              
-          DEFB $02              ;;delete                
-
-SQRLOOP:  DEFB  $31             ;;duplicate             
-          DEFB  $E3             ;;get-mem-3             
-          DEFB  $C4             ;;st-mem-4              
-          DEFB  $05             ;;div                   
-          DEFB  $E3             ;;get-mem-3             
-          DEFB  $0F             ;;addition              
-          DEFB  $A2             ;;stk-half              
-          DEFB  $04             ;;multiply              
-          DEFB  $C3             ;;st-mem-3              
-          DEFB  $E4             ;;get-mem-4             
-          DEFB  $03             ;;subtract              
-          DEFB  $2A             ;;abs                   
-          DEFB  $37             ;;greater-0             
-          DEFB  $00             ;;jump-true             
-
-          DEFB  SQRLOOP - $     ;;to sqrloop              
-
-          DEFB  $02             ;;delete                
-          DEFB  $E3             ;;get-mem-3             
+          DEFB $C3              ;;st-mem-3
+          DEFB $02              ;;delete
+
+SQRLOOP:  DEFB  $31             ;;duplicate
+          DEFB  $E3             ;;get-mem-3
+          DEFB  $C4             ;;st-mem-4
+          DEFB  $05             ;;div
+          DEFB  $E3             ;;get-mem-3
+          DEFB  $0F             ;;addition
+          DEFB  $A2             ;;stk-half
+          DEFB  $04             ;;multiply
+          DEFB  $C3             ;;st-mem-3
+          DEFB  $E4             ;;get-mem-4
+          DEFB  $03             ;;subtract
+          DEFB  $2A             ;;abs
+          DEFB  $37             ;;greater-0
+          DEFB  $00             ;;jump-true
+
+          DEFB  SQRLOOP - $     ;;to sqrloop
+
+          DEFB  $02             ;;delete
+          DEFB  $E3             ;;get-mem-3
           DEFB  $38             ;;end-calc              sqr x.
 
           jp __FPSTACK_POP
-          
+
+          pop namespace
+
 END ASM
 END FUNCTION
 ```