doc operators' ASCII/Unicode variants

fix #1560

Author: tisonkun

doc/Language/operators.pod6

@@ -240,6 +240,9 @@ with C<R>. Associativity of operands is reversed as well.
 
 =head1 X<<<Hyper Operators|hyper,<<;hyper,>>;hyper,«;hyper,»>>>
 
+Hyper Operators include C<«> and C<»>, with their ASCII variants C«<<»
+and C«>>».
+
 Hyper operators apply a given operator enclosed by C<«> and C<»> to one or two
 lists, returning the resulting list. The pointy part of C<«> or C<»> has to
 point to the shorter list. A list with just one element is fine too. If one of
@@ -1660,11 +1663,12 @@ for the type on the right-hand side of the operator.
     multi sub infix:<=~=>(Complex:D, Complex:D)
     multi sub infix:<=~=>(Numeric:D, Numeric:D)
 
-The X<approximately-equal operator|infix, ≅>. Calculates the relative difference between
-the left-hand and right-hand sides and returns C<True> if the difference is
-less than $*TOLERANCE (which defaults to 1e-15). However, if either side is zero
-then it checks that the absolute difference between the sides is less than $*TOLERANCE.
-Note that this operator is not arithmetically symmetrical (doesn't do ± Δ):
+The approximately-equal operator X<C<≅>|infix, ≅>, whose ASCII variant is
+C<=~=>. Calculates the relative difference between the left-hand and right-hand
+sides and returns C<True> if the difference is less than $*TOLERANCE
+(which defaults to 1e-15). However, if either side is zero then it checks that
+the absolute difference between the sides is less than $*TOLERANCE. Note that
+this operator is not arithmetically symmetrical (doesn't do ± Δ):
 
     my $x = 1;
     say ($x + $*TOLERANCE) =~= $x;   # OUTPUT: «False␤»