docs/control/README.md: Fix MD034 warnings

The following warnings are generated by using markdownlint analysis:
```
docs/control/README.md:243:1 MD034/no-bare-urls Bare URL used [Context: "https://github.com/openbmc/pho..."]
```
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: I48595b22044c4fc22741d302862bc6c7260d1cc7
diff --git a/docs/control/README.md b/docs/control/README.md
index 321912b..197c873 100644
--- a/docs/control/README.md
+++ b/docs/control/README.md
@@ -240,7 +240,7 @@
 
 Fans can be queried and controlled manually using the fanctl utility. Full
 documentation can be found at
-https://github.com/openbmc/phosphor-fan-presence/blob/master/docs/control/fanctl/README.md
+<https://github.com/openbmc/phosphor-fan-presence/blob/master/docs/control/fanctl/README.md>
 
 ## Validation