Doc: Fix a typo in "Function Examples" in the control-flow tutorial (… #248

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

xz 5.6.3 is already installed and up-to-date. To reinstall 5.6.3, run: brew reinstall xz

gdbm 1.24 is already installed and up-to-date. To reinstall 1.24, run: brew reinstall gdbm

tcl-tk 8.6.15 is already installed and up-to-date. To reinstall 8.6.15, run: brew reinstall tcl-tk

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