Remove non-existent ISO section numbers suffixed with "(x)" [ci skip]

We don't know how we introduced these section references.
Weak memories.

mrblib/array.rb

@@ -117,11 +117,9 @@ class Array
   ##
   # Return the contents of this array as a string.
   #
-  # ISO 15.2.12.5.31 (x)
   def inspect
     self._inspect({})
   end
-  # ISO 15.2.12.5.32 (x)
   alias to_s inspect
 
   ##
@@ -132,7 +130,6 @@ class Array
   #  of elements and if each element is equal to (according to
   #  Object.==) the corresponding element in the other array.
   #
-  # ISO 15.2.12.5.33 (x)
   def ==(other)
     other = self.__ary_eq(other)
     return false if other == false
@@ -153,7 +150,6 @@ class Array
   #  Returns <code>true</code> if +self+ and _other_ are the same object,
   #  or are both arrays with the same content.
   #
-  # ISO 15.2.12.5.34 (x)
   def eql?(other)
     other = self.__ary_eq(other)
     return false if other == false
@@ -181,7 +177,6 @@ class Array
   #  the same length and the value of each element is equal to the
   #  value of the corresponding element in the other array.
   #
-  # ISO 15.2.12.5.36 (x)
   def <=>(other)
     other = self.__ary_cmp(other)
     return 0 if 0 == other

mrblib/hash.rb

@@ -39,7 +39,6 @@ class Hash
   # Returns <code>true</code> if <i>hash</i> and <i>other</i> are
   # both hashes with the same content compared by eql?.
   #
-  # ISO 15.2.13.4.32 (x)
   def eql?(hash)
     return true if self.equal?(hash)
     unless Hash === hash
@@ -215,11 +214,9 @@ class Hash
   ##
   # Return the contents of this hash as a string.
   #
-  # ISO 15.2.13.4.30 (x)
   def inspect
     self._inspect({})
   end
-  # ISO 15.2.13.4.31 (x)
   alias to_s inspect
 
   ##