Updated alt text for images in integrations/kroki.md and labels.md

doc/administration/integration/kroki.md

@@ -116,7 +116,7 @@ The above blocks are converted to an HTML image tag with source pointing to the
 Kroki instance. If the Kroki server is correctly configured, this should
 render a nice diagram instead of the block:
 
-![PlantUML diagram](../img/kroki_plantuml_diagram.png)
+![A PlantUML diagram rendered from example code.](../img/kroki_plantuml_diagram.png)
 
 Kroki supports more than a dozen diagram libraries. Here's a few examples for AsciiDoc:
 
@@ -147,7 +147,7 @@ digraph finite_state_machine {
 ....
 ```
 
-![GraphViz diagram](../img/kroki_graphviz_diagram.png)
+![A GraphViz diagram generated from example code.](../img/kroki_graphviz_diagram.png)
 
 **C4 (based on PlantUML)**
 
@@ -173,7 +173,7 @@ Rel(banking_system, mainframe, "Uses")
 ....
 ```
 
-![C4 PlantUML diagram](../img/kroki_c4_diagram.png)
+![A C4 PlantUML diagram generated from example code.](../img/kroki_c4_diagram.png)
 
 <!-- vale gitlab_base.Spelling = NO -->
 
@@ -200,4 +200,4 @@ Rel(banking_system, mainframe, "Uses")
 ....
 ```
 
-![Diagram](../img/kroki_nomnoml_diagram.png)
+![A Nomnoml diagram generated from example code.](../img/kroki_nomnoml_diagram.png)

doc/administration/labels.md

@@ -21,7 +21,7 @@ Labels created in the **Admin** area are automatically added to new projects.
 They are not available to new groups.
 Updating or adding labels in the **Admin** area does not modify labels in existing projects.
 
-![Default label set](img/admin_labels_v17_0.png)
+![Admin Area with default label set, proposal and regression.](img/admin_labels_v17_0.png)
 
 <!-- ## Troubleshooting