Fix various typos
Found via `codespell -q 3 -S ./perf/texts -L actualy,ba,beng,fo,gir,inout,nd,ot,pres,ro,te,teh,timne`
diff --git a/src/gen-os2-unicode-ranges.py b/src/gen-os2-unicode-ranges.py
index 21aa1b9..b1a34d4 100755
--- a/src/gen-os2-unicode-ranges.py
+++ b/src/gen-os2-unicode-ranges.py
@@ -1,7 +1,7 @@
#!/usr/bin/env python3
"""Generates the code for a sorted unicode range array as used in hb-ot-os2-unicode-ranges.hh
-Input is a tab seperated list of unicode ranges from the otspec
+Input is a tab separated list of unicode ranges from the otspec
(https://docs.microsoft.com/en-us/typography/opentype/spec/os2#ur).
"""
