Add C520WS to ONVIF PTZ camera recommendations.

[arevindh]

Added C520WS and updated C210.

• C520WS to ONVIF PTZ working on firmware 1.2.6
• Auto tracking is not working.
• Spelling correction in the existing list.
• C210 working with PTZ on firmware version 1.3.11

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[CoMPaTech]

You are concurring a typo as incompelete (e.g. the two Tapo's above have the same typo for incomplete) :)

[arevindh]

@CoMPaTech oops, I just copied it from the last one. Updated. C210 PTZ is also working now.