Add scm_has_make_hash_table to doc.

Add scm_has_make_hash_table to doc.

[Hugo Hörnquist]

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I added a reference to to scm_make_hash_table to the
documentation. I do however wonder if there was some reason
for it's omission, and what other procedures might require
documentation still.
-- 
Hugo Hörnquist (hugo)

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From b62aacf62b6c7773065781292ef9200519e1c7fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Wed, 1 May 2019 21:35:16 +0200
Subject: [PATCH] Add scm_make_hash_table to documenation.

---
 doc/ref/api-data.texi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
index 5b9c5654e..a0560c28e 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -9939,6 +9939,7 @@ addition to @code{hashq} etc below, include @code{symbol-hash}
 
 @sp 1
 @deffn {Scheme Procedure} make-hash-table [size]
+@deffn {C Function} scm_make_hash_table (size)
 Create a new hash table object, with an optional minimum
 vector @var{size}.
 
-- 
2.17.1