do_count(): Fix the table_store() comment
do_count(): Fix the table_store() comment

Reason:
The linkage count that we find (not the null count) is actually
to be updated in the created table entry.
Also, we don't have a tentative value for it in the table (but if we
pre-assign 0 we may save several code lines below - maybe later).

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