patch markdown linting of special header

README.md

@@ -138,8 +138,13 @@ The fields in the table below can be used in these parts of STAC documents:
 
 [1]: #1-allowed-only-in-item-properties
 
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 ##### <sup>[1]</sup> Allowed Only in Item `properties`
 
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 > [!NOTE]
 > Unless stated otherwise by <sup>[\[1\]][1]</sup> in the table, fields can be used at either the Item or Asset level.
 > <br><br>