Update copyright year in filter_specifications.md and fixed markdown format

Author: SmartLamScott

docs/filter_specifications.md

@@ -1,10 +1,10 @@
 # Filter Specifications
 
-(c) 2024 Scott Ratchford
+(c) 2026 Scott Ratchford
 
 This file is licensed under the MIT License. See LICENSE.txt for details.
 
-Filters are JSON objects containing conditional checks and comparisons to perform on the instance variables, properties, and methods of any Python object. To use a method in a filter, the method definition must be decorated with the `@filter_criterion'. Instance variables and properties can be used without the decorator.
+Filters are JSON objects containing conditional checks and comparisons to perform on the instance variables, properties, and methods of any Python object. To use a method in a filter, the method definition must be decorated with the `@filter_criterion`. Instance variables and properties can be used without the decorator.
 
 ## Extended Backus-Naur Form of Filter Specifications