Fix typo in JDK 7u4 Mac OS X Port Installer

Typo #1 --
The introduction page of the installer reads:
"The Java Development Kit is a development
environment for building applications,applets,
and component..."

A space should be inserted between the comma and "applets" so that it reads:
"... for building applications, applets, ..."

Typo #2 --
After successful installation, the installer's "Install Succeeded" message reads:
"Next Steps? Access Tutorials, the Java Docs, demons, samples, and Java tools to help you get started with the JDK".

- "Tutorials" seems to be capitalized for no reason
- A period should be added at the end of the sentence (so that it reads "... get started with the JDK.")