node: add missing environment variables to --help and man page
Added NODE_REPL_HISTORY to the environment variables in the --help
print and made all descriptions start with lower case for consistency with the options descriptions above.
Before:
Environment variables:
NODE_PATH ':'-separated list of directories
prefixed to the module search path.
NODE_DISABLE_COLORS Set to 1 to disable colors in the REPL
NODE_ICU_DATA Data path for ICU (Intl object) data
After:
Environment variables:
NODE_PATH ':'-separated list of directories
prefixed to the module search path.
NODE_DISABLE_COLORS set to 1 to disable colors in the REPL
NODE_ICU_DATA data path for ICU (Intl object) data
NODE_REPL_HISTORY persistent history file location
cc: @Fishrock123 @chrisdickinson