scylla-gdb.py: scylla_fiber: fix misaligned text in docstring
scylla-gdb.py: scylla_fiber: fix misaligned text in docstring

avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla