fix some gramatics

3. quite cumbersome formulation
6. grammatically incorrect word forms
9. duplicate verb in wrong form
Format WebRTC TOS, Bug 1033615
Merge pull request #147 from kyoshino/bug-1033615-webrtc-format

Format WebRTC TOS, Bug 1033615
correct the URL in #4
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Update cs.md
correct the URL in #4
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correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4
correct the URL in #4