Fix syntax broken highlighting

[oz123]

Hugo's highlighter does not understand a variable name with angle
brackets, and breaks the coloring.

This is a fix for #15829

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[xiangpengzhao]

/lgtm
@oz123 thanks for the fix!
/assign @MistyHacks @tengqm

[mdlinville]

Please revert your change and replace the < and > characters with [ and ] respectively. The change you have made implies meaning that isn't there (this is syntax for Bash, and isn't appropriate in a YAML file).

[mdlinville]

/lgtm
/approve

[oz123]

Please revert your change and replace the < and > characters with [ and ] respectively. The change you have made implies meaning that isn't there (this is syntax for Bash, and isn't appropriate in a YAML file).

I did replace the variable notation with brackets.

@MistyHacks that was the quickest response ever :-)
10x.

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