[PATCH v2 18/22] wispr: Document 'wispr_portal_web_result_err'.

Add documentation to the 'wispr_portal_web_result_err' function.
---
 src/wispr.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/wispr.c b/src/wispr.c
index 18930aa3a0ea..b3fc99949206 100644
--- a/src/wispr.c
+++ b/src/wispr.c
@@ -1003,6 +1003,29 @@ static bool wispr_manage_message(GWebResult *result,
 	return false;
 }
 
+/**
+ *  @brief
+ *    Handle closure and finalization of a web request associated with
+ *    an unsuccessful "online" HTTP-based Internet reachability check.
+ *
+ *  @param[in]      result      A pointer to the mutable web request
+ *                              result being finalized.
+ *  @param[in,out]  wp_context  A pointer to the mutable WISPr portal
+ *                              detection context associated with the
+ *                              unsuccessful "online" HTTP-based
+ *                              Internet reachability check this is
+ *                              finalizing.
+ *  @param[in]      err         The negated POSIX domain error
+ *                              associated with the unsuccessful
+ *                              "online" HTTP-based Internet
+ *                              reachability check.
+ *
+ *  @sa wispr_portal_web_result
+ *  @sa wispr_portal_web_result_no_err
+ *
+ *  @private
+ *
+ */
 static void wispr_portal_web_result_err(GWebResult *result,
 		struct connman_wispr_portal_context *wp_context,
 		int err)
-- 
2.45.0