Fix SVG close tag, improve commit graph page UI alignment (#23751)

Follow #23748

Thanks to @delvh 

----

And, fix the UI alignment by the way (adding some `gt-mr-xx`)

Before:


![image](https://user-images.githubusercontent.com/2114189/228034794-7a6ac8d6-01fa-4dd2-97d4-0df0368f8ee0.png)

After:


![image](https://user-images.githubusercontent.com/2114189/228034938-64edeadf-7c99-4e74-b658-0ca62b72d596.png)

Author: wxiaoguang

templates/repo/graph/commits.tmpl

@@ -28,10 +28,10 @@
 							{{- end -}}
 						</a>
 					</span>
-					<span class="message gt-dib gt-ellipsis gt-mr-2">
+					<span class="message gt-dib gt-ellipsis gt-mr-3">
 						<span>{{RenderCommitMessage $.Context $commit.Subject $.RepoLink $.Repository.ComposeMetas}}</span>
 					</span>
-					<span class="tags gt-df gt-ac">
+					<span class="tags gt-df gt-ac gt-mr-2">
 						{{range $commit.Refs}}
 							{{$refGroup := .RefGroup}}
 							{{if eq $refGroup "pull"}}
@@ -54,20 +54,20 @@
 									{{svg "octicon-git-branch" 16 "gt-mr-2"}}{{.ShortName}}
 								</a>
 							{{else}}
-								<!-- Unknown ref type {{.Name}} -->
+								<!-- Unknown ref type .Name -->
 							{{end}}
 						{{end}}
 					</span>
-					<span class="author gt-df gt-ac gt-mr-2">
+					<span class="author gt-df gt-ac gt-mr-3">
 						{{$userName := $commit.Commit.Author.Name}}
 						{{if $commit.User}}
 							{{if $commit.User.FullName}}
 								{{$userName = $commit.User.FullName}}
 							{{end}}
-							{{avatar $.Context $commit.User}}
+							<span class="gt-mr-2">{{avatar $.Context $commit.User}}</span>
 							<a href="{{$commit.User.HomeLink}}">{{$userName}}</a>
 						{{else}}
-							{{avatarByEmail $.Context $commit.Commit.Author.Email $userName}}
+							<span class="gt-mr-2">{{avatarByEmail $.Context $commit.Commit.Author.Email $userName}}</span>
 							{{$userName}}
 						{{end}}
 					</span>

templates/repo/graph/svgcontainer.tmpl

@@ -14,9 +14,9 @@
 					{{- else if eq $glyph.Glyph '_' -}}
 						M {{Add (Mul $glyph.Column 5) 0}} {{Add (Mul $glyph.Row 12) 12}} h 10 {{/* */ -}}
 					{{- end -}}
-				{{- end}}" stroke-width="1" fill="none" id="flow-{{$flow.ID}}-path" stroke-linecap="round">
+				{{- end}}" stroke-width="1" fill="none" id="flow-{{$flow.ID}}-path" stroke-linecap="round"></path>
 				{{range $flow.Commits}}
-					<circle class="flow-commit" cx="{{Add (Mul .Column 5) 5}}" cy="{{Add (Mul .Row 12) 6}}" r="2.5" stroke="none" id="flow-commit-{{.Rev}}" data-rev="{{.Rev}}">
+					<circle class="flow-commit" cx="{{Add (Mul .Column 5) 5}}" cy="{{Add (Mul .Row 12) 6}}" r="2.5" stroke="none" id="flow-commit-{{.Rev}}" data-rev="{{.Rev}}"></circle>
 				{{end}}
 			</g>
 		{{end}}