cosmetic: OsmoGSMTester: fix dir name

All other subdirs are without dashes, but I added Osmo-GSM-Tester with dashes.
Comply with the naming scheme and remove dashes.

Change-Id: I36d0c94dde5deffba04b27436ae499a42c519bec
diff --git a/doc/manuals/chapters/debugging.adoc b/doc/manuals/chapters/debugging.adoc
new file mode 100644
index 0000000..bea1e5c
--- /dev/null
+++ b/doc/manuals/chapters/debugging.adoc
@@ -0,0 +1,4 @@
+[[debugging]]
+== Debugging
+
+*TODO*: describe how to invoke 'ipdb3' and step into a suite's test script