Update trial.html

[orangesunny]

grammar fix

Before submitting pull request, please ensure that:

• Every commit has a message which describes it
• Every commit is needed on its own, if you have just minor fixes to previous commits, you can squash them
• Any code changes come with test case
• Any new functionality is covered by user documentation

[codecov]

Codecov Report

Merging #4461 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4461   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files         535      535           
  Lines       41037    41037           
  Branches     4383     4383           
=======================================
  Hits        37783    37783           
  Misses       2165     2165           
  Partials     1089     1089