doc: fix quoting in suggested parallel test invocation

* t/README: Fix reversed single/double quotes.

diff --git a/t/README b/t/README
index 23dd943f5fa6726b3eca0a4be7f55a26856a7ea5..bc69baa6df4fc7e13627aa14a5277c4dea58accf 100644 (file)
--- a/t/README
+++ b/t/README
@@ -204,7 +204,7 @@ Writing test cases
   'run_make' function rather than calling $MAKE directly.  Not only is
   this more idiomatic, but it also avoid possible spurious racy failures
   when the make invocations in the testsuite are run in parallel mode
-  (as with "make check AM_TESTSUITE_MAKE='make -j4"').
+  (as with "make check AM_TESTSUITE_MAKE='make -j4'").
 
 * Do not override Makefile variables using make arguments, as in e.g.: