docs: Remove obsolete claims about Blueslip wrapping things.
docs: Remove obsolete claims about Blueslip wrapping things.

These are obsolete since e0a18d3394a61d059f743612052b6a2a809f138d
(#12737).

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

zulip/zulip,shubhamdhama/zulip,brainwane/zulip,showell/zulip,rht/zulip,punchagan/zulip,kou/zulip,brainwane/zulip,punchagan/zulip,eeshangarg/zulip,timabbott/zulip,timabbott/zulip,andersk/zulip,hackerkid/zulip,timabbott/zulip,shubhamdhama/zulip,rht/zulip,eeshangarg/zulip,timabbott/zulip,synicalsyntax/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,hackerkid/zulip,kou/zulip,synicalsyntax/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,zulip/zulip,synicalsyntax/zulip,hackerkid/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,showell/zulip,hackerkid/zulip,shubhamdhama/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,timabbott/zulip,andersk/zulip,andersk/zulip,andersk/zulip,timabbott/zulip,showell/zulip,kou/zulip,punchagan/zulip,rht/zulip,punchagan/zulip,brainwane/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip,showell/zulip,shubhamdhama/zulip,zulip/zulip,andersk/zulip,rht/zulip,shubhamdhama/zulip,shubhamdhama/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,rht/zulip,hackerkid/zulip,kou/zulip,synicalsyntax/zulip,brainwane/zulip,showell/zulip,brainwane/zulip,eeshangarg/zulip,timabbott/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,punchagan/zulip