[doc] Improve dev_install for Windows and LLVM 10

[yuanming-hu]

Related issue = #655

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[codecov]

Codecov Report

Merging #1202 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1202      +/-   ##
==========================================
- Coverage   67.09%   66.85%   -0.25%     
==========================================
  Files          35       35              
  Lines        4835     4827       -8     
  Branches      886      885       -1     
==========================================
- Hits         3244     3227      -17     
- Misses       1417     1424       +7     
- Partials      174      176       +2     

Impacted Files	Coverage Δ
python/taichi/lang/matrix.py	82.93% <0.00%> (-1.86%)	⬇️
python/taichi/lang/util.py	50.93% <0.00%> (-0.90%)	⬇️
python/taichi/lang/kernel.py	78.49% <0.00%> (-0.32%)	⬇️
python/taichi/lang/common_ops.py	90.55% <0.00%> (-0.06%)	⬇️
python/taichi/main.py	43.53% <0.00%> (+0.26%)	⬆️

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[TH3CHARLie]

Thanks for improving the developer docs. Just a few tweaks.

[Eydcao]

Hi Yuanming,

Should we also address the multiple instances of MSBUILD.exe on Windows (first commit in #1021)? Like a simple note in the ymal file? This stuck me for a long time once.

[yuanming-hu]

Hi Yuanming,

Should we also address the multiple instances of MSBUILD.exe on Windows (first commit in #1021)? Like a simple note in the ymal file? This stuck me for a long time once.

Sure, please do that in #1021. Sorry about getting you stuck!

[Eydcao]

Hi Yuanming,
Should we also address the multiple instances of MSBUILD.exe on Windows (first commit in #1021)? Like a simple note in the ymal file? This stuck me for a long time once.

Sure, please do that in #1021. Sorry about getting you stuck!

Sure thing I will handle the conflict there.~ Thanks LGTM!

[Eydcao]

Much clearer doc!

LGTM