Proof Luminary099/TIME_OF_FREE_FALL

Fix two transcription errors found by comparing against scan pages 1275-1276:

- Page 1275 (R0293-R0295): MOD BY: 3/4/5 -> MOD NO: 3/4/5
  The modification number field was transcribed as MOD BY instead of MOD NO
  for entries 3, 4, and 5. MOD NO: 1 and MOD NO: 2 above them were correct.

- Page 1276 (R0393): M:(-36+2N4) -> M:(-36+2NR)
  The R in NR was misread as 4. Every other instance of this scale factor
  in the file correctly reads 2NR.

Partially resolves #647

Author: 0xDI

Luminary099/TIME_OF_FREE_FALL.agc

@@ -307,9 +307,9 @@ DUMPRPRA	RVQ
 # MOD BY:  RR BAIRNSFATHER
 # MOD NO:  1	MOD BY:  RR BAIRNSFATHER	DATE: 21 MAR 67
 # MOD NO:  2	MOD BY:  RR BAIRNSFATHER	DATE: 14 APR 67
-# MOD BY:  3	MOD BY:  RR BAIRNSFATHER	DATE: 8 JUL 67		NEAR EARTH MUE AND NEG TFF (GONEPAST)
-# MOD BY:  4	MOD BY:  RR BAIRNSFATHER	DATE: 21 NOV 67		ADD VARIABLE MU.
-# MOD BY:  5	MOD BY:  RR BAIRNSFATHER	DATE: 21 MAR 68		ACCEPT DIFFERENT EARTH/MOON SCALES
+# MOD NO:  3	MOD BY:  RR BAIRNSFATHER	DATE: 8 JUL 67		NEAR EARTH MUE AND NEG TFF (GONEPAST)
+# MOD NO:  4	MOD BY:  RR BAIRNSFATHER	DATE: 21 NOV 67		ADD VARIABLE MU.
+# MOD NO:  5	MOD BY:  RR BAIRNSFATHER	DATE: 21 MAR 68		ACCEPT DIFFERENT EARTH/MOON SCALES
 #
 # FUNCTIONAL DESCRIPTION:  PROGRAM CALCULATES THE FREE-FALL TIME OF FLIGHT FROM PRESENT POSITION RN AND
 #	VELOCITY VN TO A RADIUS LENGTH SPECIFIED BY RTERM, SUPPLIED BY THE USER.  THE POSITION VECTOR
@@ -383,7 +383,7 @@ DUMPRPRA	RVQ
 #				M:(-27+NR)
 #		X1				-NR, NORM COUNT				LEFT BY TFFCONIC
 #		TFFNP		E:(-38+2NR)	M  LCP, SEMI LATUS RECTUM, WEIGHT NR	LEFT BY TFFCONIC
-#				M:(-36+2N4)
+#				M:(-36+2NR)
 #		TFFALFA		E:(26-NR)	1/M  ALFA, WEIGHT NR			LEFT BY TFFCONIC
 #				M:(24-NR)
 #		TFFRTALF	E:(10+NA)	SQRT(ALFA), NORMALIZED			LEFT BY TFFCONIC