Fix examples of proc-macro crates being scraped for examples #11497
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This PR fixes #11496, where examples in proc-macro crates would crash the build with
-Zrustdoc-scrape-examples
. The fix is to changeunit_needs_doc_scrape
to check if a unit is coming from aproc-macro
package. I added a test to ensure the simple example passes. I also ensured that automod also documents correctly.r? @weihanglo