Added documentation for common mistakes in errdefer scoping #10607
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This PR adds a subsection to the Error Union Type section of the documentation to inform readers about common mistakes caused by errdefer scoping (e.g. allocated memory leaving the scope of an errdefer and being leaked) to hopefully save some people from shooting themselves in the foot. In commit e9c7987, I added a header to separate this from the errdefer subsection because I felt it was distinct enough, but it's completely optional imo
This PR is intended to resolve issue #7298