Remove undocumented #nonzero?

Author: ksss

core/complex.rbs

@@ -535,8 +535,6 @@ class Complex < Numeric
 
   def negative?: () -> bot
 
-  def nonzero?: () -> self?
-
   # <!--
   #   rdoc-file=complex.c
   #   - numerator -> new_complex

core/float.rbs

@@ -737,8 +737,6 @@ class Float < Numeric
   #
   def next_float: () -> Float
 
-  def nonzero?: () -> self?
-
   # <!--
   #   rdoc-file=rational.c
   #   - flo.numerator  ->  integer

core/integer.rbs

@@ -1015,8 +1015,6 @@ class Integer < Numeric
   #
   def nobits?: (int mask) -> bool
 
-  def nonzero?: () -> self?
-
   # <!--
   #   rdoc-file=numeric.rb
   #   - numerator -> self

core/rational.rbs

@@ -336,8 +336,6 @@ class Rational < Numeric
   #
   def negative?: () -> bool
 
-  def nonzero?: () -> self?
-
   # <!--
   #   rdoc-file=rational.c
   #   - rat.numerator  ->  integer