keyboard_shortcuts: Fix description for "e" shortcut.
keyboard_shortcuts: Fix description for "e" shortcut.

This commit updates the description for "e" shortcut so
that it at least fits in one line in english.

Fixes #23112.

zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip