Update ModSecurity guide to reflect JBCS product name changes

Update the ModSecurity guide to reflect the following JBCS product name changes:

• "Red Hat JBoss Core Services" is changing to "Red Hat JBoss Core Services Collection"
• "JBoss Core Services" is changing to "JBoss Core Services Collection"
• In section headings that don't start with the product name, prefix the product name with "the".
• In general text, prefix the product name with "The" or "the".
• In general text replace and reword any occurrences of the "JBCS" acronym with "the JBoss Core Services Collection".