[doc]: Update Command-Reference.md (sonic-net#1231)

Vlan interfaces need capitalized "V" in "Vlan" to be accepted.
stepanblyschak · Nov 13, 2020 · 599b43a · 599b43a
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commit 599b43a
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diff --git a/doc/Command-Reference.md b/doc/Command-Reference.md
@@ -2889,7 +2889,7 @@ VLAN interface names take the form of `vlan<vlan_id>`. E.g., VLAN 100 will be na
 
   *Versions >= 201904*
   ```
-  admin@sonic:~$ sudo config interface ip add vlan100 10.11.12.13/24
+  admin@sonic:~$ sudo config interface ip add Vlan100 10.11.12.13/24
   ```
   *Versions <= 201811*
   ```