Command Palette: Enable feature flag per default

And update the docs:

1. Note that the FF is enabled by default
2. Add / keyboard shortcut to the docs

Changelog: added

config/feature_flags/development/command_palette.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/413060
 milestone: '16.1'
 type: development
 group: group::foundations
-default_enabled: false
+default_enabled: true

doc/user/search/command_palette.md

@@ -7,19 +7,21 @@ type: reference
 
 # Command palette **(FREE)**
 
-> Introduced in GitLab 16.2 [with a flag](../../administration/feature_flags.md) named `command_palette`. Disabled by default.
+> Introduced in GitLab 16.2 [with a flag](../../administration/feature_flags.md) named `command_palette`. Enabled by default.
 
 You can use command palette to narrow down the scope of your search or to
 find an object more quickly.
 
 FLAG:
-On self-managed GitLab, by default this feature is not available. To make it available, ask an administrator to enable the feature flag named `command_palette`. On GitLab.com, this feature is not available.
+On self-managed GitLab, by default this feature is available.
+To hide the feature, ask an administrator to [disable the feature flag](../../administration/feature_flags.md) named `command_palette`.
+On GitLab.com, this feature is available.
 
 ## Open the command palette
 
 To open the command palette:
 
-1. On the left sidebar, at the top, select **Search GitLab** (**{search}**).
+1. On the left sidebar, at the top, select **Search GitLab** (**{search}**) or use the <kbd>/</kbd> key to enable.
 1. Type one of the special characters:
 
    - <kbd>></kbd> - Create a new object or find a menu item.