Add code samples for sub-setting methods

[irenejoeunpark]

Issue #269
Added/updated code samples for sub-setting methods

Added reset samples and updated update samples for the following sub-setting methods.

• Synonyms
• Stop-words
• Searchable attributes
• Displayed attributes
• Attributes for faceting
• Distinct attribute

[curquiza]

Thanks for your PR @irenejoeunpark
@alallema is on holiday right now and will review your PR once she comes back :)

[alallema]

Thanks for this PR @irenejoeunpark!
I propose some fixes and also if you want to update the update_ranking_rules_1, here is the code:

  client.index("movies").updateRankingRuleSettings(new String[]
  {
    "words",
    "typo",
    "proximity",
    "attribute",
    "sort",
    "exactness",
    "release_date:asc",
    "rank:desc"
  });

[alallema]

I forgot to say that all the get sub-settings samples should be updated too. They have all been renamed with Settings at the end.
For example:

client.index("movies").getRankingRules();

became:

client.index("movies").getRankingRuleSettings();

[alallema]

bors merge

[bors]

Build succeeded:

• integration-and-unit-tests
• linter