scripts: runner: pyocd: fix stale comment

This isn't just a flasher anymore.

Signed-off-by: Marti Bolivar <marti@opensourcefoundries.com>
diff --git a/scripts/support/runner/pyocd.py b/scripts/support/runner/pyocd.py
index d98579e..384b8c1 100644
--- a/scripts/support/runner/pyocd.py
+++ b/scripts/support/runner/pyocd.py
@@ -13,7 +13,7 @@
 
 
 class PyOcdBinaryRunner(ZephyrBinaryRunner):
-    '''Runner front-end for pyocd-flashtool.'''
+    '''Runner front-end for pyOCD.'''
 
     def __init__(self, target, flashtool='pyocd-flashtool',
                  gdb=None, gdbserver='pyocd-gdbserver',