Apply suggestions from code review

Co-authored-by: Christos Aridas <[email protected]>

Author: glemaitre

doc/metrics.rst

@@ -87,7 +87,7 @@ Value Difference Metric
 The class :class:`~imblearn.metrics.pairwise.ValueDifferenceMetric` is
 implementing the Value Difference Metric proposed in
 :cite:`stanfill1986toward`. This measure is used to compute the proximity
-of two samples composed of only nominal categorical features.
+of two samples composed of only nominal values.
 
 Given a single feature, categories with similar correlation with the target
 vector will be considered closer. Let's give an example to illustrate this

imblearn/metrics/_classification.py

@@ -1,5 +1,5 @@
 # coding: utf-8
-"""Metrics to assess performance on classification task given class
+"""Metrics to assess performance on a classification task given class
 predictions. The available metrics are complementary from the metrics available
 in scikit-learn.