Editing pass for the Reactor Netty Reference Guide

[Buzzardo]

I edited for spelling, punctuation, grammar, usage, and corporte voice. I also added leader paragraphs in places that didn't have them.

[codecov-io]

Codecov Report

Merging #642 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #642      +/-   ##
============================================
- Coverage     65.44%   65.41%   -0.04%     
- Complexity     1366     1367       +1     
============================================
  Files           127      127              
  Lines          6428     6428              
  Branches        875      875              
============================================
- Hits           4207     4205       -2     
- Misses         1739     1744       +5     
+ Partials        482      479       -3

Impacted Files	Coverage Δ	Complexity Δ
...ctor/netty/resources/PooledConnectionProvider.java	78.38% <0%> (-2.57%)	22% <0%> (ø)
...eactor/netty/http/server/HttpServerOperations.java	69.29% <0%> (-0.44%)	61% <0%> (ø)
...eactor/netty/channel/ChannelOperationsHandler.java	70.48% <0%> (-0.23%)	64% <0%> (-1%)
...eactor/netty/http/client/HttpClientOperations.java	60.28% <0%> (+0.85%)	66% <0%> (+1%)	⬆️
...r/netty/http/server/WebsocketServerOperations.java	63.41% <0%> (+1.21%)	18% <0%> (+1%)	⬆️
src/main/java/reactor/netty/FutureMono.java	67.5% <0%> (+2.5%)	8% <0%> (ø)	⬇️

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[violetagg]

Thanks