docs: update admonitions to new shortcode format

[JStickler]

What this PR does / why we need it:

The format of the admonition shortcode changed a while back and I end up correcting this in a lot of PRs. Since I think many people probably copy and paste from an existing shortcode that they find in the files, I'm updating all of the shortcodes to the correct format.

[loki-gh-app]

The backport to release-3.2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-14735-to-release-3.2.x origin/release-3.2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 3d6d35e97619f369182373bf25962494634fe653

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.2.x
# Create the PR body template
PR_BODY=$(gh pr view 14735 --json body --template 'Backport 3d6d35e97619f369182373bf25962494634fe653 from #14735{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title 'docs: update admonitions to new shortcode format (backport release-3.2.x)' --body-file - --label 'size/L' --label 'type/docs' --label 'backport' --base release-3.2.x --milestone release-3.2.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.2.x

# Create a pull request where the `base` branch is `release-3.2.x` and the `compare`/`head` branch is `backport-14735-to-release-3.2.x`.

# Remove the local backport branch
git switch main
git branch -D backport-14735-to-release-3.2.x

[loki-gh-app]

The backport to release-3.1.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-14735-to-release-3.1.x origin/release-3.1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 3d6d35e97619f369182373bf25962494634fe653

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.1.x
# Create the PR body template
PR_BODY=$(gh pr view 14735 --json body --template 'Backport 3d6d35e97619f369182373bf25962494634fe653 from #14735{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title 'docs: update admonitions to new shortcode format (backport release-3.1.x)' --body-file - --label 'size/L' --label 'type/docs' --label 'backport' --base release-3.1.x --milestone release-3.1.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.1.x

# Create a pull request where the `base` branch is `release-3.1.x` and the `compare`/`head` branch is `backport-14735-to-release-3.1.x`.

# Remove the local backport branch
git switch main
git branch -D backport-14735-to-release-3.1.x

[loki-gh-app]

The backport to release-3.0.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-14735-to-release-3.0.x origin/release-3.0.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 3d6d35e97619f369182373bf25962494634fe653

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.0.x
# Create the PR body template
PR_BODY=$(gh pr view 14735 --json body --template 'Backport 3d6d35e97619f369182373bf25962494634fe653 from #14735{{ "\n\n---\n\n" }}{{ index . "body" }}')
# Create the PR on GitHub
echo "${PR_BODY}" | gh pr create --title 'docs: update admonitions to new shortcode format (backport release-3.0.x)' --body-file - --label 'size/L' --label 'type/docs' --label 'backport' --base release-3.0.x --milestone release-3.0.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-14735-to-release-3.0.x

# Create a pull request where the `base` branch is `release-3.0.x` and the `compare`/`head` branch is `backport-14735-to-release-3.0.x`.

# Remove the local backport branch
git switch main
git branch -D backport-14735-to-release-3.0.x