Fix typo in total_volatile_organic_compounds_concentration_measuremen… (CON-1140)

[kibergus]

The header and other locations use plural compounds in the namespace name. But .cpp has the functions defined in a namespace with a singular compound. As a result attempting to define tvoc sensor leads to undefined symbols during linking.

#911

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[jadhavrohit924]

Thanks for the PR @kibergus

[dhrishi]

Hi @kibergus The changes are merged with c9cae5a. The commits were squashed during merge and that's why the PR didn't get auto-closed. Sorry for the confusion.