Merge tag 'pull-qapi-2024-03-04' of https://repo.or.cz/qemu/armbru into staging

QAPI patches patches for 2024-03-04

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# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
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# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* tag 'pull-qapi-2024-03-04' of https://repo.or.cz/qemu/armbru:
  migration: simplify exec migration functions
  qapi: New strv_from_str_list()
  qapi: New QAPI_LIST_LENGTH()
  docs/devel/writing-monitor-commands: Minor improvements
  docs/devel/writing-monitor-commands: Repair a decade of rot
  qapi: Reject "Returns" section when command doesn't return anything
  qga/qapi-schema: Fix guest-set-memory-blocks documentation
  qga/qapi-schema: Tweak documentation of fsfreeze commands
  qga/qapi-schema: Clean up "Returns" sections
  qga/qapi-schema: Delete useless "Returns" sections
  qga/qapi-schema: Move error documentation to new "Errors" sections
  qapi/yank: Tweak @yank's error description for consistency
  qapi: Clean up "Returns" sections
  qapi: Delete useless "Returns" sections
  qapi: Move error documentation to new "Errors" sections
  qapi: New documentation section tag "Errors"
  qapi: Slightly clearer error message for invalid "Returns" section
  qapi: Memorize since & returns sections

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/devel/qapi-code-gen.rst

@@ -996,7 +996,8 @@ line "Features:", like this::
 
 A tagged section begins with a paragraph that starts with one of the
 following words: "Note:"/"Notes:", "Since:", "Example:"/"Examples:",
-"Returns:", "TODO:".  It ends with the start of a new section.
+"Returns:", "Errors:", "TODO:".  It ends with the start of a new
+section.
 
 The second and subsequent lines of tagged sections must be indented
 like this::
@@ -1007,6 +1008,9 @@ like this::
  #     Duis aute irure dolor in reprehenderit in voluptate velit esse
  #     cillum dolore eu fugiat nulla pariatur.
 
+"Returns" and "Errors" sections are only valid for commands.  They
+document the success and the error response, respectively.
+
 A "Since: x.y.z" tagged section lists the release that introduced the
 definition.