QFT kata: fix formula formatting in square wave prep exercise

[tcNickolas]

No description provided.

[tcNickolas]

Current version in playground:

Fixed version:

[github-actions]

Benchmark for d215520

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Test	Base	PR	%
Array append evaluation	335.8±4.97µs	338.7±2.84µs	+0.86%
Array literal evaluation	186.3±2.44µs	169.0±2.88µs	-9.29%
Array update evaluation	411.5±2.04µs	416.3±3.18µs	+1.17%
Core + Standard library compilation	22.4±0.56ms	23.9±1.09ms	+6.70%
Deutsch-Jozsa evaluation	5.0±0.07ms	5.0±0.06ms	0.00%
Large file parity evaluation	35.0±0.27ms	35.2±0.58ms	+0.57%
Large input file compilation	13.7±0.50ms	13.6±0.68ms	-0.73%
Large input file compilation (interpreter)	55.0±2.29ms	55.7±2.23ms	+1.27%
Large nested iteration	33.1±0.30ms	33.1±0.23ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1586.7±64.89µs	1601.6±107.28µs	+0.94%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.9±0.08ms	7.9±0.09ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1453.6±73.49µs	1447.9±59.46µs	-0.39%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	28.0±0.27ms	28.5±0.62ms	+1.79%
Teleport evaluation	93.5±3.38µs	93.3±3.64µs	-0.21%