Fix typo in introduction.rst

[hsm207]

Reference Issue

What does this implement/fix? Explain your changes.

In

-and adding a sampling functionality throw the sample method::

"throw" should be "through".

Any other comments?

[codecov]

Codecov Report

Merging #368 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #368   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files          68       68           
  Lines        3924     3924           
=======================================
  Hits         3875     3875           
  Misses         49       49

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[glemaitre]

Thanks!