Wiki on adding a new generator could use some small edits

[jonnybot0]

I made my way to the wiki page on Adding a new generator from the page on standalone generator development.

I couldn't resist making a few edits. Totally understand if the team don't want them, but you can upstream them from https://github.com/jonnybot0/swagger-codegen-generators/wiki/Adding-a-new-generator-for-a-language-or-framework.#codegen-pojos. Sadly, GitHub doesn't do PRs for wikis, so you'd have to do it the hard way. If you want them, here's a script to make it easy in your current local clone of the wiki:

cd swagger-codegen-generators.wiki
git remote add jonnybot0 https://github.com/jonnybot0/swagger-codegen-generators.wiki.git
git fetch jonnybot0
git merge jonnybot0/master
git push origin master

If not, no hard feelings. They're purely stylistic/grammar changes, so you can take it or leave it. :)