docs: inconsistent syntax highlighting in cli docs

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[x] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

Note the syntax highlighting of build and version as compared add and new

[textbook]

Links: e.g. ng add, ng build. It seems to be because new and add are being treated as keywords, they have extra formatting:

<span class="cli-name">
  <span class="kwd">new</span>
</span>

vs.

<span class="cli-name">
  <span class="pln">build</span>
</span>

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