Stylistic changes:
- use more direct language, per [k8s style guide](https://kubernetes.io/docs/contribute/style/style-guide/#use-simple-and-direct-language)
  - "Using webHDFS protocol via HTTP artifacts" -> "webHDFS via HTTP artifacts"
  - "In order to use [...] we will make use of" -> "You can use"
  - "HTTP URL" -> "URL"
    - also consistently use the term "query paramter" instead of "HTTP URL parameter", which is ambiguous (path params, query params, etc)
  - "need to append" -> "append"
  - "This results in the following URL" -> "The result is"
  - "Now, when run, the workflow will" -> "The workflow will"
  - "There are some additional fields that can be set" -> "Additional fields can be set"
  - "In order to declare" -> "To delcare"
  - "need to change [...] to" -> "instead use"
  - "where we want the [...] to be stored" -> "your desired location"
  - "want to store the artifact under" -> "artifact will be stored at"
  - "also supply the optional overwrite [...] to allow [...]" -> "can overwrite [...] with"
  - "may want to provide some authentication option" -> "may want to use authentication"
  - "a usage of [...] can be realized by supplying" -> "can be used via"
  - several other more complex / multi-sentence simplifications

- use in-line links, per [k8s style guide](https://kubernetes.io/docs/contribute/style/style-guide/#links)
- consistently use "the full webHDFS example" when referring to the main example (instead of differing descriptions for the same example)

- remove "all you need", "little change", "only", etc per [k8s style guide](https://kubernetes.io/docs/contribute/style/style-guide/#avoid-words-that-assume-a-specific-level-of-understanding)
- address the reader as "you", per [k8s style guide](https://kubernetes.io/docs/contribute/style/style-guide/#address-the-reader-as-you)
- replace Latin phrases, per [k8s style guide](https://kubernetes.io/docs/contribute/style/style-guide/#avoid-latin-phrases)

- move "Additional fields" sentence to after the in-line example, as the example does not use those and it is a side note
- comment out elipses in code blocks so that they are more copyable / valid syntax
- use an infobox instead of "**Limitation**:" to be consistent with the rest of the docs

- minor grammatical fixes
  - extra commas, extra articles, etc

Semantic changes:
- add links to HTTP artifacts and the `overwrite` parameter
  - remove note about `overwrite` depending on provider. the (newly linked) docs specify that it defaults to `false`
- clarify the difference between Hadoop native auth and provider dependent auth
  - specify that tokens are used via the `delegation` query param, per the linked docs

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>