Fix AWSCredentialsService Table Render Issue
Fix AWSCredentialsService Table Render Issue

Under AWSCredentialsService section, the Properties markdown table was not rendering. I realized the markdown table was missing a hyphen '-' and pipe '|' for the last header. I added this missing markdown and now the table renders correctly.

Signed-off-by: Arpad Boda <aboda@apache.org>

This closes #762

dtrodrigues/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,apiri/nifi-minifi-cpp,apiri/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,apiri/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,apiri/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,apiri/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,achristianson/nifi-minifi-cpp