Minor changes to add clarity to the instructions

This is what displays:

[WARNING] Please select the Fixers you want to run. Selected Fixers are denoted by a leading '*'.
[INFO] 
    1 - ArtifactIdNameFixer    - Fix the <artifactId/> to match the folder name on pom.xml files
    2 - FileHeaderFixer        - Fix the license header on all files
    3 - FinalNameFixer         - Fix <finalName/> on all pom.xml files
    4 - JavaSourcesFormatFixer - Run the Eclipse source code formatter on all Java source files
    5 - LicenseFixer           - Apply Apache V2 license to all pom.xml files
    6 - MavenCompilerFixer     - Fix the maven.compiler.(source|target) from pom.xml files
    7 - PomNameFixer           - Replace the <name/> on pom.xml with the expected pattern
    8 - UnusedPropertiesFixer  - Remove unused properties from pom.xml files
    9 - XMLTabFixer            - Replace [TABS] by [spaces] on XMLs files
    10 - PomElementOrderFixer  - Fix the pom.xml element order
    A - Select All             - Add all Fixers to the list to be run
    N - Select None            - Remove all currently selected Fixers from the list to be run

    R - Run the plugin using the selected list of fixers (denoted by an *)
    Q - Quit without running any fixers

Enter the number of the Fixer to select/deselect it. Enter 'A' to select all. Enter 'N' to deselect all. 

When ready, enter 'R' to run the selected list of Fixers or 'Q' to quit.