use non-breaking spaces

Author: tbrowder

doc/Language/tables.pod6

@@ -18,10 +18,10 @@ in something different than the user expects).
 
 =head1 Restrictions
 
-1. The only valid column separators are either visible (V<' | '> or V<' + '>)
+1. The only valid column separators are either visible (V<' | '> or V<' + '>)
 (note at least one space is required before and after the visible column
 separators) or invisible [two or more contiguous whitespace (WS)
-characters (e.g., V<'  '>)]. Column separators are not normally recognized
+characters (e.g., V<'  '>)]. Column separators are not normally recognized
 as such at the left or right side of a table, but one on the right side may
 result in one or more empty cells depending upon the number of the cells in
 other rows. (Note that currently a pipe or plus character meant as part of cell
@@ -30,7 +30,7 @@ data will result in an unintentended extra column.)
 2. Mixing visible and invisible column separators in the same table is
 illegal.
 
-3. The only valid row separator characters are V<'_'>, V<'-'>, V<'+'>, V<' '>,
+3. The only valid row separator characters are V<'_'>, V<'-'>, V<'+'>, V<' '>,
 V<'|'>, and V<'='>.
 
 4. Consecutive interior row-separator lines are illegal.