[fix][doc] Adjust the install command of the gtest and gmock in document (#15980)
[fix][doc] Adjust the install command of the gtest and gmock in document (#15980)


massakam/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar