Fix the asyncio example ioc, and documentation

[AlexanderWells-diamond]

Also tweak the wording on the exception logging

[codecov[bot]]

Codecov Report

Merging #99 (d06e9f7) into master (f9960ce) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #99   +/-   ##
=======================================
  Coverage   87.72%   87.72%           
=======================================
  Files          14       14           
  Lines         961      961           
=======================================
  Hits          843      843           
  Misses        118      118           

Impacted Files	Coverage Δ
softioc/asyncio_dispatcher.py	93.33% <0.00%> (ø)

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Unit Test Results

     15 files  ±0       15 suites  ±0   22m 14s :stopwatch: +42s    230 tests ±0     224 :heavy_check_mark: ±0      6 :zzz: ±0  0 :x: ±0  3 450 runs  ±0  3 010 :heavy_check_mark: ±0  440 :zzz: ±0  0 :x: ±0 

Results for commit d06e9f77. ± Comparison against base commit f9960ceb.