docs: sort inputs lexicographically

Whether this is the best ordering is subjective, but I prefer a specific
ordering like this until I see a better one (perhaps by categories or
so).

README.md

@@ -105,6 +105,12 @@ jobs:
 
 The action can be configured with the following optional [inputs](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepswith):
 
+### `copy_assignees`
+
+Default: `''` (disabled)
+
+Controls wheather the assignees of the original pull request should be added to the backports.
+
 ### `copy_labels_pattern`
 
 Default: `''` (disabled)
@@ -113,6 +119,18 @@ Regex pattern to match github labels which will be copied from the original pull
 Note that labels matching `label_pattern` are excluded.
 By default, no labels are copied.
 
+### `copy_milestone`
+
+Default: `''` (disabled)
+
+Controls wheather the "milestone" of the original pull request should be added to the backports.
+
+### `copy_reviewers`
+
+Default: `''` (disabled)
+
+Controls wheather the reviewers of the original pull request should be added to the backports.
+
 ### `github_token`
 
 Default: `${{ github.token }}`
@@ -185,26 +203,6 @@ See [How it works](#how-it-works).
 Can be used in addition to backport labels.
 By default, only backport labels are used to specify the target branches.
 
-
-### `copy_milestone`
-
-Default: `''` (disabled)
-
-Controls wheather the "milestone" of the original pull request should be added to the backports.
-
-### `copy_assignees`
-
-Default: `''` (disabled)
-
-Controls wheather the assignees of the original pull request should be added to the backports.
-
-### `copy_reviewers`
-
-Default: `''` (disabled)
-
-Controls wheather the reviewers of the original pull request should be added to the backports.
-
-
 ## Placeholders
 In the `pull_description` and `pull_title` inputs, placeholders can be used to define variable values.
 These are indicated by a dollar sign and curly braces (`${placeholder}`).

action.yml

@@ -3,11 +3,23 @@ description: >
   Fast and flexible action to cherry-pick commits from labeled pull requests
 author: korthout
 inputs:
+  copy_assignees:
+    description: >
+      Whether or not to copy the assignees from the original pull request to the backport pull request.
+      By default, the assignees are not copied.
   copy_labels_pattern:
     description: >
       Regex pattern to match github labels which will be copied from the original pull request to the backport pull request.
       Note that labels matching `label_pattern` are excluded.
       By default, no labels are copied.
+  copy_milestone:
+    description: >
+      Whether or not to copy the milestone from the original pull request to the backport pull request.
+      By default, the milestone is not copied.
+  copy_reviewers:
+    description: >
+      Whether or not to copy the reviewers from the original pull request to the backport pull request.
+      By default, the reviewers are not copied.
   github_token:
     description: >
       Token to authenticate requests to GitHub.
@@ -53,18 +65,6 @@ inputs:
       Note that the pull request's headref is excluded automatically.
       Can be used in addition to backport labels.
       By default, only backport labels are used to specify the target branches.
-  copy_milestone:
-    description: >
-      Whether or not to copy the milestone from the original pull request to the backport pull request.
-      By default, the milestone is not copied.
-  copy_assignees:
-    description: >
-      Whether or not to copy the assignees from the original pull request to the backport pull request.
-      By default, the assignees are not copied.
-  copy_reviewers:
-    description: >
-      Whether or not to copy the reviewers from the original pull request to the backport pull request.
-      By default, the reviewers are not copied.
 outputs:
   was_successful:
     description: >