fix documentation for send_template_batch

[gregsadetsky]

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[codecov[bot]]

Codecov Report

Merging #210 (2056c40) into master (c571701) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 2056c40 differs from pull request most recent head 1e40d4b. Consider uploading reports for the commit 1e40d4b to get more accurate results

@@            Coverage Diff            @@
##            master      #210   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          915       915           
  Branches       130       130           
=========================================
  Hits           915       915           

Impacted Files	Coverage Δ
src/postmarker/models/emails.py	100.00% <ø> (ø)

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