manpage: A clearer description of the special command format
manpage: A clearer description of the special command format

The current description is somewhat erroneous. It says
"special "!" options can be specified either on the command-line"
but when specifying them on the command line they are not proceeded by
"!"...

Clarify that.
Also always call them "special "!" commands" and not "Special "!" options".

ampli/link-grammar,opencog/link-grammar,ampli/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar,linas/link-grammar,opencog/link-grammar,linas/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,opencog/link-grammar,opencog/link-grammar,ampli/link-grammar,linas/link-grammar,linas/link-grammar,ampli/link-grammar,linas/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar