Fix typo in ResamplingError docstring

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

src/frequenz/sdk/timeseries/_resampling/_exceptions.py

@@ -31,7 +31,7 @@ def __repr__(self) -> str:
 
 
 class ResamplingError(RuntimeError):
-    """An Error ocurred while resampling.
+    """An Error occurred while resampling.
 
     This error is a container for errors raised by the underlying sources and
     or sinks.