docs: mention scripts/testnum in the test suite docs
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| @@ -256,6 +256,7 @@ up. Subsets of tests can now be selected by passing keywords to the | |
| runtests.pl script via the make `TFLAGS` variable. | |
| New tests are added by finding a free number in `tests/data/Makefile.am`. | |
| + | The script `scripts/testnum` automates this search for you. |
| ## Write tests | |