Merge from origin/emacs-26

5c91ca8 Fix create_process bug breaking eudc-expand-inline
e244fed Clarify that nil doesn't match itself as a cl-case clause (Bu...
df0e7e2 Improve SVG documentation
a34ef52 Document the "URL" keyword in library headers
fbc7f9a * test/lisp/international/mule-tests.el: Avoid local variable...
16faff6 ; * lisp/org/org-table.el: Replace obsolete alias in comment.

diff --cc lisp/emacs-lisp/cl-macs.el
Simple merge

diff --cc src/process.c
Simple merge