hotkey: Update deprecation notice for '*' hotkey.
hotkey: Update deprecation notice for '*' hotkey.

This PR updates the shortcut of the deprecation notice
for '*' hotkey. On macOS, it should be 'Cmd + s' instead
of 'Ctrl'.

zulip/zulip,punchagan/zulip,rishig/zulip,eeshangarg/zulip,tommyip/zulip,kou/zulip,shubhamdhama/zulip,jackrzhang/zulip,rishig/zulip,tommyip/zulip,zulip/zulip,shubhamdhama/zulip,brainwane/zulip,synicalsyntax/zulip,kou/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,zulip/zulip,zulip/zulip,dhcrzf/zulip,eeshangarg/zulip,andersk/zulip,tommyip/zulip,rishig/zulip,shubhamdhama/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,synicalsyntax/zulip,jackrzhang/zulip,synicalsyntax/zulip,andersk/zulip,andersk/zulip,showell/zulip,dhcrzf/zulip,brainwane/zulip,andersk/zulip,tommyip/zulip,eeshangarg/zulip,hackerkid/zulip,rht/zulip,rishig/zulip,showell/zulip,hackerkid/zulip,synicalsyntax/zulip,tommyip/zulip,dhcrzf/zulip,timabbott/zulip,jackrzhang/zulip,dhcrzf/zulip,punchagan/zulip,showell/zulip,showell/zulip,jackrzhang/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,shubhamdhama/zulip,andersk/zulip,timabbott/zulip,kou/zulip,timabbott/zulip,eeshangarg/zulip,zulip/zulip,punchagan/zulip,jackrzhang/zulip,rht/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,synicalsyntax/zulip,brainwane/zulip,zulip/zulip,shubhamdhama/zulip,andersk/zulip,brainwane/zulip,rishig/zulip,timabbott/zulip,rht/zulip,tommyip/zulip,rishig/zulip,timabbott/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,jackrzhang/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,showell/zulip,rht/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,synicalsyntax/zulip,dhcrzf/zulip,synicalsyntax/zulip,kou/zulip,tommyip/zulip,timabbott/zulip,rishig/zulip,brainwane/zulip,showell/zulip,punchagan/zulip,hackerkid/zulip,dhcrzf/zulip,timabbott/zulip,kou/zulip