Fix code example in RFrac doc comment

[swernli]

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Change in memory usage detected by benchmark.

Memory Report for c778cab

Test	This Branch	On Main	Difference
compile core + standard lib	17962736 bytes	17962728 bytes	8 bytes

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Benchmark for c778cab

Click to view benchmark

Test	Base	PR	%
Array append evaluation	331.5±2.13µs	340.5±5.91µs	+2.71%
Array literal evaluation	186.1±0.70µs	169.4±1.90µs	-8.97%
Array update evaluation	411.2±2.13µs	418.6±5.37µs	+1.80%
Core + Standard library compilation	21.9±0.27ms	21.8±0.24ms	-0.46%
Deutsch-Jozsa evaluation	4.9±0.06ms	4.9±0.05ms	0.00%
Large file parity evaluation	34.5±0.24ms	34.5±0.65ms	0.00%
Large input file compilation	13.6±0.27ms	13.6±0.23ms	0.00%
Large input file compilation (interpreter)	50.7±1.52ms	50.8±1.65ms	+0.20%
Large nested iteration	32.6±0.48ms	33.3±0.16ms	+2.15%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1562.1±40.39µs	1561.5±29.34µs	-0.04%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.8±0.07ms	7.7±0.07ms	-1.28%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1422.8±28.50µs	1424.1±29.79µs	+0.09%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.6±0.22ms	27.5±0.16ms	-0.36%
Teleport evaluation	93.4±3.61µs	93.0±3.72µs	-0.43%