Fix minor typo and add Helm chart link

[gtseres]

What does this PR do?

Fixes a minor typo and adds a link to the Helm chart for deploying the Datadog agent with the k8s operator

Motivation

The motivation is to contribute to the documentation

Additional Notes

N/A

[codecov-commenter]

Codecov Report

Merging #106 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   57.29%   57.29%           
=======================================
  Files          31       31           
  Lines        4185     4185           
=======================================
  Hits         2398     2398           
  Misses       1606     1606           
  Partials      181      181           

Flag	Coverage Δ
#unittests	57.29% <ø> (ø)

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[ahmed-mez]

Thank you @gtseres !