[FAB-5916] Fix spelling error
[FAB-5916] Fix spelling error

[FAB-5916] Fix spelling error in common/tools/cryptogen/ca/ca.go at line
189,modify 'certficate' to 'certificate'.

Change-Id: I73678e550a3f4d9feb1dbde75ac79137d4305ec1
Signed-off-by: Zhangjiong Xuan <6ef00a8c87d2390d0e2a368b3fd85320ee227a2a@hyperchain.cn>

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