docs: fix typo in vendor-prefixes for Digilent Inc.

This commit corrects the spelling to reflect the official name

Signed-off-by: Dhruv Menon <dhruvmenon1104@gmail.com>

Author: malto101

dts/bindings/vendor-prefixes.txt

@@ -178,7 +178,7 @@ dfrobot	DFRobot
 dh	DH electronics GmbH
 difrnce	Shenzhen Yagu Electronic Technology Co., Ltd.
 digi	Digi International Inc.
-digilent	Diglent, Inc.
+digilent	Digilent, Inc.
 diodes	Diodes Incorporated
 dioo	Dioo Microcircuit Co., Ltd
 dlc	DLC Display Co., Ltd.