Set language parameter as a non-required field for Screen Text API

[v-sodsou]

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File: specification/cognitiveservices/data-plane/ContentModerator/readme.md
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[v-sodsou]

@jianghaolu
Hi , I have modified the language parameter as a non-required field for Content Moderator Cognitive Service -ScreenText API. Could you please review this pull request.

Thanks
Sonali Dsouza