#11 improve doc for exp_continue command

[Hemang Lavana]

The man pages of expect does not list the optional argument
-continue_timer option under exp_continue command:

exp_continue
The command exp_continue allows expect itself to continue
executing rather than returning as it normally would. (See
expect for more information.)

Yes, the -continue_timer option is mentioned under expect
command, but it is difficult to find this info unless we know
what to look for. Please change the above text to something
like:

exp_continue [ -continue_timer ]
The command exp_continue allows expect itself to continue
executing rather than returning as it normally would. By default
exp_continue resets the timeout timer. The -continue_timer
flag prevents timer from being restarted. (See expect for
more information.)

[Andreas Kupries]

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Proposed change committed to HEAD and "expect-sf418892-
sf439042-branch".