Update core.py

Author: orena1

src/blosc2/core.py

@@ -894,7 +894,7 @@ def free_resources() -> None:
 
     The number of threads can also be set via the ``BLOSC_NTHREADS`` environment
     variable (e.g., ``export BLOSC_NTHREADS=1``). Additionally, you may want to set
-    ``NUMEXPR_NUM_THREADS`` as well since numexpr is used under the hood 
+    ``NUMEXPR_NUM_THREADS`` as well since numexpr is used under the hood
     (e.g., ``export NUMEXPR_NUM_THREADS=1``).
 
     Examples