[gimp] docs, etc: regenerate the default gimprc and its manpage.

[Jehan <jehanp src gnome org>]

commit 9453f0420c0b205c898b0e7da67131466c2b934a
Author: Jehan <jehan girinstud io>
Date:   Wed Oct 13 00:51:03 2021 +0200

    docs, etc: regenerate the default gimprc and its manpage.

 docs/gimprc.5.in | 9 +++++++--
 etc/gimprc.in    | 8 ++++++--
 2 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/docs/gimprc.5.in b/docs/gimprc.5.in
index eafb6ff6ea..a48c623a5e 100644
--- a/docs/gimprc.5.in
+++ b/docs/gimprc.5.in
@@ -456,6 +456,11 @@ Export the image's color profile by default.  Possible values are yes and no.
 
 Export the image's comment by default.  Possible values are yes and no.
 
+.TP
+(export-thumbnail yes)
+
+Export the image's thumbnail by default  Possible values are yes and no.
+
 .TP
 (export-metadata-exif yes)
 
@@ -486,12 +491,12 @@ Possible values are yes and no.
 .TP
 (check-update-timestamp 0)
 
-Timestamp of the last update check.  (null)
+Timestamp of the last update check.  This is an integer value.
 
 .TP
 (last-release-timestamp 0)
 
-The timestamp for the last known release date.  (null)
+The timestamp for the last known release date.  This is an integer value.
 
 .TP
 
diff --git a/etc/gimprc.in b/etc/gimprc.in
index 8dba21a3ab..71d66fe16c 100644
--- a/etc/gimprc.in
+++ b/etc/gimprc.in
@@ -374,6 +374,10 @@
 # 
 # (export-comment yes)
 
+# Export the image's thumbnail by default  Possible values are yes and no.
+# 
+# (export-thumbnail yes)
+
 # Export Exif metadata by default.  Possible values are yes and no.
 # 
 # (export-metadata-exif yes)
@@ -396,11 +400,11 @@
 # 
 # (check-updates yes)
 
-# Timestamp of the last update check.  (null)
+# Timestamp of the last update check.  This is an integer value.
 # 
 # (check-update-timestamp 0)
 
-# The timestamp for the last known release date.  (null)
+# The timestamp for the last known release date.  This is an integer value.
 # 
 # (last-release-timestamp 0)