Fixed more typos, wording & updated links

[hbugdoll]

What are you changing/introducing

• Fixed typos and misspellings:
  • and a the → and the
  • built in into → built into
  • case sensitive → case-sensitive
  • ip → IP
  • is build → is built
  • Its very → It's very
  • let´s → lets
  • loadbalancer → load balancer
  • modelClass based → modelClass-based
  • multi language → multi-language
  • out of the box → out-of-the-box
  • REST formatted → REST-formatted
  • setlocale → setLocale()
  • servers' configuration → server configuration
  • sub relations → sub-relations
  • To do so ... → To do so, ...
  • trough → through
  • WEB-Route → WEB route
  • and some syntax typos
• Corrected indefinite articltes a / an
• Corrected wording: Active Selection, API, CLI, GET, NgRest, URL
• Updated links to new guide:
  • https://luya.io/guide/app-queue → https://luya.io/guide/app/queue
  • https://luya.io/guide/ngrest-concept → https://luya.io/guide/ngrest
  • https://luya.io/guide/ngrest-plugin-select → https://luya.io/guide/ngrest/plugin-select

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