Move Object#hash rdoc to hash.c [ci skip]

This gets RDoc to pick up the documentation correctly.

Problem pointed out by zverok (Victor Shepelev).

1 files changed, 19 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index 808544793b..9a863962e7 100644
--- a/hash.c
+++ b/hash.c
@@ -280,6 +280,25 @@ objid_hash(VALUE obj)
 #endif
 }
 
+/**
+ * call-seq:
+ *    obj.hash    -> integer
+ *
+ * Generates an Integer hash value for this object.  This function must have the
+ * property that <code>a.eql?(b)</code> implies <code>a.hash == b.hash</code>.
+ *
+ * The hash value is used along with #eql? by the Hash class to determine if
+ * two objects reference the same hash key.  Any hash value that exceeds the
+ * capacity of an Integer will be truncated before being used.
+ *
+ * The hash value for an object may not be identical across invocations or
+ * implementations of Ruby.  If you need a stable identifier across Ruby
+ * invocations and implementations you will need to generate one with a custom
+ * method.
+ *--
+ * \private
+ *++
+ */
 VALUE
 rb_obj_hash(VALUE obj)
 {