Update docs to remove kramdown warnings

doc/administration/auth/smartcard.md

@@ -123,8 +123,8 @@ attribute. As a prerequisite, you must use an LDAP server that:
 
    NOTE: **Note**
    Assign a value to at least one of the following variables:
-   gitlab_rails['smartcard_client_certificate_required_host'] or
-   gitlab_rails['smartcard_client_certificate_required_port'].
+   `gitlab_rails['smartcard_client_certificate_required_host']` or
+   `gitlab_rails['smartcard_client_certificate_required_port']`.
 
 1. Save the file and [reconfigure](../restart_gitlab.md#omnibus-gitlab-reconfigure)
    GitLab for the changes to take effect.

doc/development/experiment_guide/gitlab_experiment.md

@@ -525,7 +525,7 @@ Conditional means that it returns `true` in some situations, but not all situati
 
 When a feature flag is disabled (meaning the state is `off`), the experiment is
 considered _inactive_. You can visualize this in the [decision tree diagram](#how-it-works)
-as reaching the first [Running?] node, and traversing the negative path.
+as reaching the first `Running?` node, and traversing the negative path.
 
 When a feature flag is rolled out to a `percentage_of_actors` or similar (meaning the
 state is `conditional`) the experiment is considered to be _running_

doc/user/group/index.md

@@ -428,7 +428,7 @@ To prevent a project from being shared with other groups:
 
 1. Go to the group's **Settings > General** page.
 1. Expand the **Permissions, LFS, 2FA** section.
-1. Select **Prevent sharing a project within <group_name> with other groups**.
+1. Select **Prevent sharing a project within `<group_name>` with other groups**.
 1. Select **Save changes**.
 
 ## Prevent members from being added to a group **(PREMIUM)**