fix this heading (#1034)

OSC · Dec 2, 2024 · 701c121 · 701c121
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diff --git a/source/how-tos/app-development/interactive/sub-apps.rst b/source/how-tos/app-development/interactive/sub-apps.rst
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 Sub-Apps and Reconfiguring existing apps
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 Sub-Apps are a term we use for providing variants of existing apps.
 They act as a child to the existing parent application.  That is,