Fix typo in SNMP Data Fields example documentation

[sam-banks]

Hi,

I was reading the Icinga Director documentation and spotted a typo in the Data Fields example: SNMP page. I've included a patch to fix the typo.

Thanks!

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[sam-banks]

I've signed and submitted the CLA, can you please verify?

[lippserd]

@sam-banks Thank you for taking the time to submit the PR.

@cla-bot check

[sam-banks]

Thanks for accepting the changes @lippserd. Is there anything further required on my end? Should this issue remain open?

[lippserd]

Thanks for accepting the changes @lippserd. Is there anything further required on my end? Should this issue remain open?

Nope, I will just merge it.

[sam-banks]

Thanks again :)