PEP 847: "Problem Details for the Simple Repository API" (#5119)

Signed-off-by: William Woodruff <william@yossarian.net>
Co-authored-by: Jelle Zijlstra <jelle@openai.com>
Co-authored-by: Jacob Coffee <jacob@z7x.org>

Author: 3 people

.github/CODEOWNERS

@@ -719,6 +719,7 @@ peps/pep-0841.rst  @corona10 @sobolevn
 peps/pep-0842.rst  @ZeroIntensity
 peps/pep-0843.rst  @ZeroIntensity
 peps/pep-0844.rst  @warsaw
+peps/pep-0847.rst  @dstufft
 # ...
 peps/pep-2026.rst  @hugovk
 # ...