style: pre-commit fixes

Author: pre-commit-ci[bot]

CHANGELOG.md

@@ -8,8 +8,8 @@
 - anisotropic susceptibilities are now allowed.
 - Improve susceptibility input possibilities:
   - give susceptibility to parent collection
-  - if susceptibility input is scalar, isotropic susceptibility is assumed, if it
-    is a 3-vector it can be anisotropic
+  - if susceptibility input is scalar, isotropic susceptibility is assumed, if
+    it is a 3-vector it can be anisotropic
 - Various tests included of interface and computation, isotropic and anisotropic
   tests confirm computaiton