Include batch statistics discussion in methodology introduction #3076
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Description
In #2562, it was pointed out that in the Theory and Methodology section of the docs, there were relatively few lines explaining that OpenMC uses batch statistics as the default (and only) mode of presenting variance. This could be problematic considering that it's possible for different codes that a user may be familiar with to use other methods (significantly MCNP, which uses "fast_history" as default for its tallies).
This PR adds a short snippet to the methodology introduction page stating the use of batch statistics. It also embeds some links to other statistics-relevant parts of the documentation, namely Statistics and Run Strategy.
Checklist