Cleanup scaladocs

[daniellacosse]

Meant to help address issue https://github.com/tumblr/colossus/issues/417

Fills in a lot of the missing parameter descriptions, name mismatches, etc.

@benblack86 @aliyakamercan

[nsauro]

I saw some typo's in RetryPolicy's docs as well :-p.

[codecov-io]

Codecov Report

Merging #573 into develop will increase coverage by 0.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop    #573      +/-   ##
==========================================
+ Coverage    84.52%   84.9%   +0.38%     
==========================================
  Files           99      99              
  Lines         4432    4431       -1     
  Branches       357     356       -1     
==========================================
+ Hits          3746    3762      +16     
+ Misses         686     669      -17

Impacted Files	Coverage Δ
...s/src/main/scala/colossus/metrics/Collection.scala	97.43% <ø> (ø)	:arrow_up:
...cala/colossus/protocols/memcache/MemcacheOps.scala	76.31% <ø> (ø)	:arrow_up:
...main/scala/colossus/protocols/redis/RedisOps.scala	92.94% <ø> (ø)	:arrow_up:
...sus/src/main/scala/colossus/streaming/Source.scala	84.72% <ø> (ø)	:arrow_up:
...src/main/scala/colossus/metrics/MetricSystem.scala	93.18% <ø> (+2.27%)	:arrow_up:
...rc/main/scala/colossus/core/server/ServerDSL.scala	85.71% <ø> (ø)	:arrow_up:
...src/main/scala/colossus/metrics/StatReporter.scala	73.91% <ø> (ø)	:arrow_up:
...ossus/src/main/scala/colossus/core/ServerRef.scala	83.33% <ø> (ø)	:arrow_up:
...s/src/main/scala/colossus/core/server/Server.scala	94.44% <0%> (-0.63%)	:arrow_down:
...s/src/main/scala/colossus/service/ServiceDSL.scala	85.41% <0%> (ø)	:arrow_up:
... and 16 more

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