Update azure_loadbalancer.md to fix typo

[jianliao82]

fix typo
incase -> in case
selction -> selection

What this PR does / why we need it:

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Release note:

fix typo 
incase -> in case
selction -> selection

[andyzhangx]

/approve no-issue
/sig azure
/lgtm

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[andyzhangx]

/ok-to-test

[andyzhangx]

/release-note-none

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