Fix typo in comment (Reference-LAPACK PR735)
*> \param[in] ISPEC
*> \verbatim
*> ISPEC is INTEGER
-*> Specifies whether to test just for inifinity arithmetic
+*> Specifies whether to test just for infinity arithmetic
*> or whether to test for infinity and NaN arithmetic.
*> = 0: Verify infinity arithmetic only.
*> = 1: Verify infinity and NaN arithmetic.
