Changing Inf to ∞ in code samples

Refs #1520. I chose this one because it's got a log of Inf. Not
changed in text or when it actually returns Inf.

doc/Type/Range.pod6

@@ -43,11 +43,11 @@ Use the L<...|/language/operators#infix_...> sequence operator to produce lists
 go from larger to smaller values, or to use offsets other than
 increment-by-1 and other complex cases.
 
-Use C<Inf> or C<*> (Whatever) to indicate an end point to be open-ended.
+Use C<∞> or C<*> (Whatever) to indicate an end point to be open-ended.
 
 =for code
 for 1..* { .say };       # start from 1, continue until stopped
-for 1..Inf { .say };     # the same
+for 1..∞ { .say };     # the same
 
 =head2 Ranges in subscripts
 
@@ -87,8 +87,8 @@ As an example:
 
 Of course, an infinite C<Range> always contains another C<Range>, therefore:
 
-    1..10 ~~ -Inf..Inf;    # True
-    1..10 ~~ -Inf^..^Inf;  # True
+    1..10 ~~ -∞..∞;    # True
+    1..10 ~~ -∞^..^∞;  # True
 
 Similarly, a C<Range> with open boundaries often includes other ranges:
 
@@ -101,8 +101,8 @@ ones:
 
    'a'..'j' ~~ 'b'..'c';  # False
    'b'..'c' ~~ 'a'..'j';  # True
-   'perl' ~~ -Inf^..^Inf; # True
-   'perl' ~~ -Inf..Inf;   # True
+   'perl' ~~ -∞^..^∞; # True
+   'perl' ~~ -∞..∞;   # True
    'perl' ~~ 1..*;        # True
 
 
@@ -173,7 +173,7 @@ Returns a list consisting of the start and end point.
 
     method infinite(Range:D: --> Bool:D)
 
-Returns C<True> if either end point was declared with C<Inf> or C<*>.
+Returns C<True> if either end point was declared with C<∞> or C<*>.
 
     say (1..5).infinite;                              # OUTPUT: «False␤»
     say (1..*).infinite;                              # OUTPUT: «True␤»
@@ -286,7 +286,7 @@ results.
 
     say (1^..5).reverse;                              # OUTPUT: «(5 4 3 2)␤»
     say ('a'..'d').reverse;                           # OUTPUT: «(d c b a)␤»
-    say (1..Inf).reverse;                             # OUTPUT: «(Inf Inf Inf ...)␤»
+    say (1..∞).reverse;                             # OUTPUT: «(Inf Inf Inf ...)␤»
 
 =head2 method Capture