Fixing expsyn generate_acc docs

Author: lukasgd

examples/expsyn/generate_acc.py

@@ -4,16 +4,16 @@
 
  $ python generate_acc.py --output-dir test_acc/ --replace-axon
 
- Will save 'l5pc.json', 'l5pc_label_dict.acc' and 'l5pc_decor.acc'
+ Will save 'simple_cell.json', 'simple_cell_label_dict.acc' and 'simple_cell_decor.acc'
  into the folder 'test_acc' that can be loaded in Arbor with:
      'cell_json, morpho, decor, labels = \
-        ephys.create_acc.read_acc("test_acc/l5pc_cell.json")'
+        ephys.create_acc.read_acc("test_acc/simple_cell_cell.json")'
  An Arbor cable cell can then be created with
      'cell = arbor.cable_cell(morphology=morpho, decor=decor, labels=labels)'
  The resulting cable cell can be output to ACC for visual inspection 
  and e.g. validating/deriving custom Arbor locset/region/iexpr 
  expressions in the Arbor GUI (File > Cable cell > Load) using
-     'arbor.write_component(cell, "l5pc_cable_cell.acc")'
+     'arbor.write_component(cell, "simple_cell_cable_cell.acc")'
 '''
 import argparse