Fixed harmless typos in comments

806a9942 · Steve Underwood · Ken Rice · 1a4f1c97 · 806a9942 · 806a9942
--- a/libs/spandsp/src/spandsp/ima_adpcm.h
+++ b/libs/spandsp/src/spandsp/ima_adpcm.h
--- a/libs/spandsp/src/spandsp/private/ima_adpcm.h
+++ b/libs/spandsp/src/spandsp/private/ima_adpcm.h