[DOC] Harmonize #>= methods

Merged: https://github.com/ruby/ruby/pull/15803

compar.c

@@ -109,10 +109,15 @@ cmp_gt(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *     obj >= other    -> true or false
+ *    self >= other -> true or false
+ *
+ *  Returns whether +self+ is "greater than or equal to" +other+;
+ *  equivalent to <tt>(self <=> other) >= 0</tt>:
+ *
+ *    'food' >= 'foo'  # => true
+ *    'foo'  >= 'foo'  # => true
+ *    'foo'  >= 'food' # => false
  *
- *  Compares two objects based on the receiver's <code><=></code>
- *  method, returning true if it returns a value greater than or equal to 0.
  */
 
 static VALUE

hash.c

@@ -4950,10 +4950,9 @@ rb_hash_lt(VALUE hash, VALUE other)
 
 /*
  *  call-seq:
- *    self >= other_hash -> true or false
+ *    self >= other -> true or false
  *
- *  Returns +true+ if the entries of +self+ are a superset of the entries of +other_hash+,
- *  +false+ otherwise:
+ *  Returns whether the entries of +self+ are a superset of the entries of +other+:
  *
  *    h0 = {foo: 0, bar: 1, baz: 2}
  *    h1 = {foo: 0, bar: 1}

numeric.c

@@ -1674,7 +1674,8 @@ rb_float_gt(VALUE x, VALUE y)
  *  call-seq:
  *    self >= other -> true or false
  *
- *  Returns +true+ if +self+ is numerically greater than or equal to +other+:
+ *  Returns whether the value of +self+ is greater than or equal to the value of +other+;
+ *  +other+ must be numeric, but may not be Complex:
  *
  *    2.0 >= 1              # => true
  *    2.0 >= 1.0            # => true
@@ -5001,10 +5002,10 @@ fix_ge(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *    self >= real -> true or false
+ *    self >= other -> true or false
  *
- *  Returns +true+ if the value of +self+ is greater than or equal to
- *  that of +other+:
+ *  Returns whether the value of +self+ is greater than or equal to the value of +other+;
+ *  +other+ must be numeric, but may not be Complex:
  *
  *    1 >= 0              # => true
  *    1 >= 1              # => true