Update server-process.md

Author: chengs

docs/source/server-process.md

@@ -123,13 +123,15 @@ the following keys:
    explicit entry.
 2. **icon_path**
    Full path to an svg icon that could be used with a launcher. Currently only used by the
-   JupyterLab launcher, when category is "Notebook" (default) or "Console".
-3. **title**
+   JupyterLab launcher, when category is "Notebook" (default) or "Console". Only text-based icon 
+   formats, such as SVG, are supported. Using binary-based formats like PNG or JPEG will
+   result in an empty icon being displayed in kernels.
+4. **title**
    Title to be used for the launcher entry. Defaults to the name of the server if missing.
-4. **path_info**
+5. **path_info**
    The trailing path that is appended to the user's server URL to access the proxied server.
    By default it is the name of the server followed by a trailing slash.
-5. **category**
+6. **category**
    The category for the launcher item. Currently only used by the JupyterLab launcher.
    By default it is "Notebook".