[elpa] externals/devdocs updated (4023409017 -> 87102d9f20)

[ELPA Syncer]

elpasync pushed a change to branch externals/devdocs.

      from  4023409017 Use star version of the now deprecated if-let and 
when-let
       new  4ad072063b Make mathjax dependency optional
       new  0434a8b8d2 Allow devdocs buffers to be bookmarked
       new  87102d9f20 Add formatting workarounds for some document types


Summary of changes:
 README.org |  5 +++--
 devdocs.el | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 55 insertions(+), 14 deletions(-)