Update modeling-foundations.rst

docs/source/modeling-foundations.rst

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 Evidence Line Representation
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-Some users of the VA-Spec want to represent curated lines of evidence that describe how a particular set of information (e.g. specific data from a published study, or subset of data items from a dataset) is interpreted as evidence as supoprting or disputing a possible fact that they ultimately want to be able to assert about a variant. 
+Some users of the VA-Spec want to represent curated lines of evidence that describe how a particular set of information (e.g. specific data from a published study, or subset of data items from a dataset) is interpreted as evidence supoprting or disputing a possible fact that they ultimately want to be able to assert about a variant. 
 
 For example, that some set of allele frequency data items from gnomAD represents a *moderate* argument *supporting* the pathogenicity of a particular variant for a particular disease.  Many organizations 'pre-curate' such arguments so that they can be tracked and efficiently and transparently combined to assert a final conclusion once sufficient evidence exists - e.g. that a variant is definitively pathogenic for some condition.