Update docs/ref/models/querysets.txt
Fix typo: replace "can can" to "can"
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@ -678,7 +678,7 @@ have ``null=True``.
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Usually, using ``select_related()`` can vastly improve performance because your
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app can avoid many database calls. However, there are times you are only
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interested in specific related models, or have deeply nested sets of
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relationships, and in these cases ``select_related()`` can can be optimized by
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relationships, and in these cases ``select_related()`` can be optimized by
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explicitly passing the related field names you are interested in. Only
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the specified relations will be followed.
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