Eliminating erroneous examples

This closes #2700. Also eliminates a few paragraphs below that did not work either.

doc/Language/packages.pod6

@@ -96,7 +96,9 @@ PROCESS     Process-related globals (superglobals). The last place dynamic varia
 COMPILING   Lexical symbols in the scope being compiled
 =end table
 
-X«|CALLER (package)»X«|CALLERS (package)»X«|DYNAMIC (package)»X«|OUTER (package)»X«|OUTERS (package)»X«|LEXICAL (package)»X«|UNIT (package)»X«|SETTING (package)»X«|PARENT (package)»X«|CLIENT (package)»
+X«|CALLER (package)»X«|CALLERS (package)»X«|DYNAMIC (package)»
+X«|OUTER (package)»X«|OUTERS (package)»X«|LEXICAL (package)»
+X«|UNIT (package)»X«|SETTING (package)»X«|PARENT (package)»X«|CLIENT (package)»
 The following relative names are also reserved but may be used
 anywhere in a name:
 
@@ -154,7 +156,7 @@ $::($foobar)           # $Foo::Bar
 @::($foobar)baz        # ILLEGAL at compile time (no operator baz)
 @::($foo)::($bar)::baz # @Foo::Bar::baz
 
-An initial C<::> doesn't imply global. Here as part of the interpolation
+An initial C<::> doesn't imply global; here as part of the interpolation
 syntax it doesn't even imply package. After the interpolation of the
 C<::()> component, the indirect name is looked up exactly as if it had
 been there in the original source code, with priority given first to
@@ -212,25 +214,13 @@ That is, the following are all identical in meaning:
 
 =for code :skip-test
 $foo
-$::{'foo'}
 ::{'$foo'}
-$::<foo>
 ::<$foo>
 
-Each of them scans lexical scopes outward, and then the current
+Each of them scans the lexical scopes outward, and then the current
 package scope (though the package scope is then disallowed when "strict" is
 in effect).
 
-As a result of these rules, you can write any arbitrary variable name as
-either of:
-
-=for code :skip-test
-$::{'!@#$#@'}
-::{'$!@#$#@'}
-
-You can also use the C<< ::<> >> form as long as there are no spaces in the
-name.
-
 =head2 Package lookup
 
 Subscript the package object itself as a hash object, the key of which is