Fix typo on merge locally step

There was a leading whitespace before the branch name for the
merge locally step.

It results to a broken command when copied/pasted as is.

app/assets/javascripts/vue_merge_request_widget/components/mr_widget_how_to_merge_modal.vue

@@ -82,7 +82,7 @@ export default {
     mergeInfo2() {
       return this.isFork
         ? `git fetch origin\ngit checkout "${this.targetBranch}"\ngit merge --no-ff "${this.sourceProjectPath}-${this.sourceBranch}"`
-        : `git fetch origin\ngit checkout "${this.targetBranch}"\ngit merge --no-ff " ${this.sourceBranch}"`;
+        : `git fetch origin\ngit checkout "${this.targetBranch}"\ngit merge --no-ff "${this.sourceBranch}"`;
     },
     mergeInfo3() {
       return this.canMerge

changelogs/unreleased/291078-fix-typo-merge-locally.yml

+---
+title: Fix typo on merge locally step
+merge_request: 49330
+author:
+type: fixed