fix: clarify message for EGITNOPERMISSION error

lib/definitions/errors.js

@@ -27,16 +27,17 @@ Please make sure to add the \`repositoryUrl\` to the [semantic-release configura
     )}).`,
   }),
   EGITNOPERMISSION: ({options}) => ({
-    message: 'The push permission to the Git repository is required.',
+    message: 'Cannot push to the Git repository.',
     details: `**semantic-release** cannot push the version tag to the branch \`${
       options.branch
-    }\` on remote Git repository with URL \`${options.repositoryUrl}\`.
-
-Please refer to the [authentication configuration documentation](${linkify(
-      'docs/usage/ci-configuration.md#authentication'
-    )}) to configure the Git credentials on your CI environment and make sure the [repositoryUrl](${linkify(
-      'docs/usage/configuration.md#repositoryurl'
-    )}) is configured with a [valid Git URL](https://git-scm.com/book/en/v2/Git-on-the-Server-The-Protocols).`,
+    }\` on the remote Git repository with URL \`${options.repositoryUrl}\`.
+
+This can be caused by:
+ - a misconfiguration of the [repositoryUrl](${linkify('docs/usage/configuration.md#repositoryurl')}) option
+ - the repository being unavailable
+ - or missing push permission for the user configured via the [Git credentials on your CI environment](${linkify(
+   'docs/usage/ci-configuration.md#authentication'
+ )})`,
   }),
   EINVALIDTAGFORMAT: ({tagFormat}) => ({
     message: 'Invalid `tagFormat` option.',