space before colon

Co-authored-by: Zach McKenzie <92116279+zm711@users.noreply.github.com>

Author: JoeZiminski

src/spikeinterface/core/generate.py

@@ -257,7 +257,7 @@ def generate_sorting_to_inject(
         The maximal number of spikes injected per units.
     injected_rate : float, default: 0.05
         The rate at which spikes are injected.
-    refractory_period_ms: float, default: 1.5
+    refractory_period_ms : float, default: 1.5
         The refractory period that should not be violated while injecting new spikes.
     seed : int, default: None
         The random seed.