scripts: csdl-to-json-converter: README.md: Fix MD034 warnings

The following warnings are generated by using markdownlint analysis:
```
MD034/no-bare-urls Bare URL used [Context: "https://github.com/openbmc/doc...";]
```
Refer to markdown-lint [1] to fix MD034
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/034-no-bare-urls.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I85dea378a1f08293b2ef071c949fd184dcc7c015
diff --git a/scripts/csdl-to-json-converter/README.md b/scripts/csdl-to-json-converter/README.md
index 424355a..46a8bc7 100644
--- a/scripts/csdl-to-json-converter/README.md
+++ b/scripts/csdl-to-json-converter/README.md
@@ -10,5 +10,5 @@
 python3 ~/Redfish-Tools/csdl-to-json-convertor/csdl-to-json.py --input ~/bmcweb/redfish-core/schema/oem/openbmc/csdl --output ~/bmcweb/redfish-core/schema/oem/openbmc/json-schema --config ~/bmcweb/scripts/csdl-to-json-converter/csdl-to-json-convertor/openbmc-config.json
 ```
 
-[1]
-https://github.com/DMTF/Redfish-Tools/blob/main/csdl-to-json-convertor/csdl-to-json.py
+[1]:
+  https://github.com/DMTF/Redfish-Tools/blob/main/csdl-to-json-convertor/csdl-to-json.py