Fix links to some headings with special chars #3494
                
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A couple of links in tables of contents were broken.
These were links where the URL fragment in the target was
auto-generated. When that happens, most special characters are removed
from the heading.
When the links in the tables of contents were written, the ones I am
fixing replaced some of the special characters with
-, instead ofstripping them.
I tested the links on my fork on the Performance and React Redux pages.
These screenshots show that the currently live auto-generated URLs
match what I am changing the links to: