Clarify Dependabot default ecosystem label behavior and naming

Author: alok-108

content/code-security/reference/supply-chain-security/dependabot-options-reference.md

@@ -462,7 +462,7 @@ Specify your own labels for all pull requests raised for a package manager.  For
 {% data variables.product.prodname_dependabot %} default behavior:
 
 * All pull requests have a `dependencies` label.
-* If you define more than one package manager, an additional label for the ecosystem or language is added to each pull request. For example: `java` for Gradle updates and `submodules` for git submodule updates.
+* An additional label for the ecosystem or language is added to all pull requests, including single-ecosystem updates. For example: `java` for Gradle updates, `submodules` for git submodule updates, or `github_actions` for {% data variables.product.prodname_actions %} updates.
 * If semantic version (SemVer) labels are present in the repository, they will be applied automatically to indicate the type of version update (`major`, `minor`, or `patch`).
 * {% data variables.product.prodname_dependabot %} creates these default labels automatically, as necessary in your repository.
 

data/reusables/dependabot/default-labels.md

@@ -1,6 +1,6 @@
 By default, {% data variables.product.prodname_dependabot %} raises pull requests with the `dependencies` label.
 
-{% data variables.product.prodname_dependabot %} also applies an ecosystem label, such as `java`, `npm`, or `github-actions`, to pull requests. {% data variables.product.prodname_dependabot %} adds both the `dependencies` label and the ecosystem label to all pull requests, including single-ecosystem updates, to improve filtering and triaging.
+{% data variables.product.prodname_dependabot %} also applies an ecosystem label, such as `java`, `npm`, or `github_actions`, to pull requests. {% data variables.product.prodname_dependabot %} adds both the `dependencies` label and the ecosystem label to all pull requests, including single-ecosystem updates, to improve filtering and triaging.
 
 {% data variables.product.prodname_dependabot %} creates the default labels it applies to pull requests if they do not already exist in the repository. If you want to use custom labels instead of the defaults, you can set the `labels` option in your `dependabot.yml` file per package ecosystem; this overrides the defaults. For more information, see [AUTOTITLE](/issues/using-labels-and-milestones-to-track-work/managing-labels) and [`labels`](/code-security/reference/supply-chain-security/dependabot-options-reference#labels--).