[DOC] add links to `Object#hash`

add links to `Object#hash` to each #`hash` methods rdocs.
[Fixes GH-567]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45329 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

array.c

@@ -3796,6 +3796,8 @@ rb_ary_eql(VALUE ary1, VALUE ary2)
  *
  *  Two arrays with the same content will have the same hash code (and will
  *  compare using #eql?).
+ *
+ *  See also Object#hash.
  */
 
 static VALUE

bignum.c

@@ -6782,6 +6782,8 @@ rb_big_aref(VALUE x, VALUE y)
  *   big.hash   -> fixnum
  *
  * Compute a hash based on the value of _big_.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

gc.c

@@ -2375,6 +2375,8 @@ id2ref(VALUE obj, VALUE objid)
  *
  *  Any hash value that exceeds the capacity of a Fixnum will be truncated
  *  before being used.
+ *
+ *  See also Object#hash.
  */
 
 VALUE

hash.c

@@ -2010,6 +2010,8 @@ hash_i(VALUE key, VALUE val, VALUE arg)
  *
  *  Compute a hash-code for this hash. Two hashes with the same content
  *  will have the same hash code (and will compare using <code>eql?</code>).
+ *
+ *  See also Object#hash.
  */
 
 static VALUE

numeric.c

@@ -1107,6 +1107,8 @@ flo_eq(VALUE x, VALUE y)
  *   float.hash  ->  integer
  *
  * Returns a hash code for this float.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

proc.c

@@ -1067,6 +1067,8 @@ rb_hash_proc(st_index_t hash, VALUE prc)
  *   prc.hash   ->  integer
  *
  * Returns a hash value corresponding to proc body.
+ *
+ * See also Object#hash.
  */
 
 static VALUE
@@ -1347,6 +1349,8 @@ method_eq(VALUE method, VALUE other)
  *    meth.hash   -> integer
  *
  * Returns a hash value corresponding to the method object.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

range.c

@@ -250,6 +250,8 @@ range_eql(VALUE range, VALUE obj)
  * Compute a hash-code for this range. Two ranges with equal
  * begin and end points (using <code>eql?</code>), and the same
  * #exclude_end? value will generate the same hash-code.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

re.c

@@ -2583,6 +2583,8 @@ static st_index_t reg_hash(VALUE re);
  *   rxp.hash   -> fixnum
  *
  * Produce a hash based on the text and options of this regular expression.
+ *
+ * See also Object#hash.
  */
 
 static VALUE
@@ -2641,6 +2643,8 @@ rb_reg_equal(VALUE re1, VALUE re2)
  *
  * Produce a hash based on the target string, regexp and matched
  * positions of this matchdata.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

string.c

@@ -2338,6 +2338,8 @@ rb_str_hash_cmp(VALUE str1, VALUE str2)
  *    str.hash   -> fixnum
  *
  * Return a hash based on the string's length, content and encoding.
+ *
+ * See also Object#hash.
  */
 
 static VALUE

struct.c

@@ -949,6 +949,8 @@ rb_struct_equal(VALUE s, VALUE s2)
  *   struct.hash   -> fixnum
  *
  * Returns a hash value based on this struct's contents (see Object#hash).
+ *
+ * See also Object#hash.
  */
 
 static VALUE

time.c

@@ -3405,6 +3405,8 @@ time_utc_p(VALUE time)
  *   time.hash   -> fixnum
  *
  * Returns a hash code for this Time object.
+ *
+ * See also Object#hash.
  */
 
 static VALUE