Fix diagram filenames, make them display properly

Currently diagram filenames have a space in the name. Have to replace a space with `%20` when make a link.

If possible, it may be better to rename the image files. But for now, use them as they are.

Signed-off-by: Arthit Suriyawongkul <arthit@gmail.com>

docs/annexes/RDF-object-model-and-identifier-syntax.md

@@ -10,15 +10,33 @@ SPDX ® Vocabulary Specification
 
 Version: 3.0
 
-![SPDX 3.0 Core+Software Model Diagram](../images/model Core+Software.png)
+### Core and Software Profiles
 
-![SPDX 3.0 Dataset Model Diagram](../images/model Dataset.png)
+![SPDX 3.0 Core and Software Profiles diagram][fig_Core_Software]
 
-![SPDX 3.0 AI Model Diagram](../images/model AI.png)
+### AI Profile
 
-![SPDX 3.0 Build Model Diagram](../images/model Build.png)
+![SPDX 3.0 AI Profile diagram][fig_AI]
 
-![SPDX 3.0 model Licensing Model Diagram](../images/model Licensing.png)
+### Build Profile
 
-![SPDX 3.0 Security Model Diagram](../images/model Security.png)
+![SPDX 3.0 Build Profile diagram][fig_Build]
 
+### Dataset Profile
+
+![SPDX 3.0 Dataset Profile diagram][fig_Dataset]
+
+### Licensing Profile
+
+![SPDX 3.0 Licensing Profile diagram][fig_Licensing]
+
+### Security Profile
+
+![SPDX 3.0 Security Profile diagram][fig_Security]
+
+[fig_Core_Software]: ../images/model%20Core+Software.png "SPDX 3.0 Core and Software Profiles diagram"
+[fig_Dataset]: ../images/model%20Dataset.png "SPDX 3.0 Dataset Profile diagram"
+[fig_AI]: ../images/model%20AI.png "SPDX 3.0 AI Profile diagram"
+[fig_Build]: ../images/model%20Build.png "SPDX 3.0 Build Profile diagram"
+[fig_Licensing]: ../images/model%20Licensing.png "SPDX 3.0 Licensing Profile diagram"
+[fig_Security]: ../images/model%20Security.png "SPDX 3.0 Security Profile diagram"