Removed code comment blocks from place holders and removed unnecessary white space.

I removed the comment blocks from the place holders and did some white space cleanup.

Just in case, here the regexes used to remove the comment blocks.

```
perl -pi -e 's/\$\{([0-9])\:\/\* code \*\/\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:\s?\/\/\s?code\s?\.\.\.\s?\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:\s?\/\/\s?code\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:\s?\# TODO\: write code\.\.\.\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:\<\!\-\- code\.\.\. \-\-\>\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:\# test code\}/\${$1}/' *.snippets
perl -pi -e 's/\$\{([0-9])\:"?\s?code}/\${$1}/' *.snippets
```