ktest: Change singular "paranthesis" to plural "parentheses"

Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/testing/ktest/sample.conf

@@ -158,7 +158,7 @@
 #
 # TEST_START IF (DEFINED ALL_TESTS || ${MYTEST} == boottest) && ${MACHINE} == gandalf
 #
-# Notice the use of paranthesis. Without any paranthesis the above would be
+# Notice the use of parentheses. Without any parentheses the above would be
 # processed the same as:
 #
 # TEST_START IF DEFINED ALL_TESTS || (${MYTEST} == boottest && ${MACHINE} == gandalf)