Fix capitalization

Author: gjbex

Diff for: source-code/command-line-arguments/Fire/README.md

@@ -5,9 +5,9 @@ applications with a command line interface.
 
 ## What is it?
 
-1. `calculator.py`/`calculations.py`: Calculator application that
+1. `calculator.py`/`calculations.py`: calculator application that
    implements addition, substraction,  multiplication and division.
-1. `sayer.py`: Illustration of grouped commands.
+1. `sayer.py`: illustration of grouped commands.
 1. `cl_logger.py`/`log_management.py`/`log_operations.py`: logging
    from the command line example.
 1. `job.py`: simple class definition to explore interacting with