One last docs fix

Author: Christian Jorgensen

src/skmatter/decomposition/_kernel_pcovc.py

@@ -87,7 +87,7 @@ class KernelPCovC(LinearClassifierMixin, _BaseKPCov):
         is used as the classifier.
 
     scale_z: bool, default=True
-        whether to scale Z prior to eigendecomposition.
+        Whether to scale Z prior to eigendecomposition.
 
     kernel : {"linear", "poly", "rbf", "sigmoid", "precomputed"} or callable, default="linear"
         Kernel.

src/skmatter/decomposition/_pcovc.py

@@ -125,7 +125,7 @@ class PCovC(LinearClassifierMixin, _BasePCov):
         is used as the classifier.
 
     scale_z: bool, default=True
-        whether to scale Z prior to eigendecomposition.
+        Whether to scale Z prior to eigendecomposition.
 
     iterated_power : int or 'auto', default='auto'
         Number of iterations for the power method computed by