oops, I realized that string-index-right which is introduced in srfi-13 has the 
same issue too, and patch update here.

>From 9911b0f9b51358d9f96b23c924b4597b8bc5f5e5 Mon Sep 17 00:00:00 2001
From: Nala Ginrut <[email protected]>
Date: Tue, 10 Sep 2013 16:17:40 +0800
Subject: [PATCH] Fixed typo of string-rindex and string-index-right document

*   doc/ref/api-data.texi (string-rindex, string-index-right)
*   libguile/srfi-13.c (string-rindex, string-index-right):
    fixed the wrong description in document
---
 doc/ref/api-data.texi |    4 ++--
 libguile/srfi-13.c    |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
index 7603180..ebf3069 100644
--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -3715,7 +3715,7 @@ Return @code{#f} if no match is found.
 @deffn {Scheme Procedure} string-rindex s char_pred [start [end]]
 @deffnx {C Function} scm_string_rindex (s, char_pred, start, end)
 Search through the string @var{s} from right to left, returning
-the index of the last occurrence of a character which
+the index of the first occurrence of a character which
 
 @itemize @bullet
 @item
@@ -3778,7 +3778,7 @@ Is @var{s1} a suffix of @var{s2}, ignoring character case?
 @deffn {Scheme Procedure} string-index-right s char_pred [start [end]]
 @deffnx {C Function} scm_string_index_right (s, char_pred, start, end)
 Search through the string @var{s} from right to left, returning
-the index of the last occurrence of a character which
+the index of the first occurrence of a character which
 
 @itemize @bullet
 @item
diff --git a/libguile/srfi-13.c b/libguile/srfi-13.c
index 4e5d572..d979a49 100644
--- a/libguile/srfi-13.c
+++ b/libguile/srfi-13.c
@@ -1709,7 +1709,7 @@ SCM_DEFINE (scm_string_index, "string-index", 2, 2, 0,
 SCM_DEFINE (scm_string_index_right, "string-index-right", 2, 2, 0,
 	    (SCM s, SCM char_pred, SCM start, SCM end),
 	    "Search through the string @var{s} from right to left, returning\n"
-	    "the index of the last occurrence of a character which\n"
+	    "the index of the first occurrence of a character which\n"
 	    "\n"
 	    "@itemize @bullet\n"
 	    "@item\n"
@@ -1774,7 +1774,7 @@ SCM_DEFINE (scm_string_index_right, "string-index-right", 2, 2, 0,
 SCM_DEFINE (scm_string_rindex, "string-rindex", 2, 2, 0,
 	    (SCM s, SCM char_pred, SCM start, SCM end),
 	    "Search through the string @var{s} from right to left, returning\n"
-	    "the index of the last occurrence of a character which\n"
+	    "the index of the first occurrence of a character which\n"
 	    "\n"
 	    "@itemize @bullet\n"
 	    "@item\n"
-- 
1.7.10.4

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