snippets tooltip display more friendly

[Zeng-J]

Description of changes:
Change snippet tooltip display

before

after(for look more friendly)

[codecov]

Codecov Report

Merging #4669 (62d2d1a) into master (07893b9) will decrease coverage by 0.00%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master    #4669      +/-   ##
==========================================
- Coverage   71.13%   71.12%   -0.01%     
==========================================
  Files         553      553              
  Lines       55566    55572       +6     
  Branches    10397    10398       +1     
==========================================
+ Hits        39526    39527       +1     
- Misses      16040    16045       +5     

Flag	Coverage Δ
unittests	71.12% <16.66%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
lib/ace/ext/language_tools.js	69.91% <16.66%> (-2.99%)	⬇️
lib/ace/editor.js	79.64% <0.00%> (-0.08%)	⬇️
lib/ace/range.js	85.51% <0.00%> (+0.68%)	⬆️

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