[gimp/gimp-2-10] etc, docs: regenerate system gimprc and its manpage

[Michael Natterer <mitch src gnome org>]

commit eb9789f241d889c860aba3841e4a5d09187f8c15
Author: Michael Natterer <mitch gimp org>
Date:   Thu Aug 16 19:04:31 2018 +0200

    etc, docs: regenerate system gimprc and its manpage

 docs/gimprc.5.in | 9 ++++++++-
 etc/gimprc.in    | 8 +++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/docs/gimprc.5.in b/docs/gimprc.5.in
index 276cec2366..abd2b886f8 100644
--- a/docs/gimprc.5.in
+++ b/docs/gimprc.5.in
@@ -353,6 +353,13 @@ Sets whether GIMP should create previews of layers and channels. Previews in
 the layers and channels dialog are nice to have but they can slow things down
 when working with large images.  Possible values are yes and no.
 
+.TP
+(group-layer-previews yes)
+
+Sets whether GIMP should create previews of layer groups. Layer group previews
+are more expensive than ordinary layer previews.  Possible values are yes and
+no.
+
 .TP
 (layer-preview-size medium)
 
@@ -976,7 +983,7 @@ When enabled, the online user manual will be used by the help system.
 Otherwise the locally installed copy is used.  Possible values are yes and no.
 
 .TP
-(user-manual-online-uri "http://docs.gimp.org/2.10";)
+(user-manual-online-uri "https://docs.gimp.org/2.10";)
 
 The location of the online user manual. This is used if 'user-manual-online'
 is enabled.  This is a string value.
diff --git a/etc/gimprc.in b/etc/gimprc.in
index 39181e54ab..9f459d23d3 100644
--- a/etc/gimprc.in
+++ b/etc/gimprc.in
@@ -285,6 +285,12 @@
 # 
 # (layer-previews yes)
 
+# Sets whether GIMP should create previews of layer groups. Layer group
+# previews are more expensive than ordinary layer previews.  Possible values
+# are yes and no.
+# 
+# (group-layer-previews yes)
+
 # Sets the preview size used for layers and channel previews in newly created
 # dialogs.  Possible values are tiny, extra-small, small, medium, large,
 # extra-large, huge, enormous and gigantic.
@@ -776,7 +782,7 @@
 # The location of the online user manual. This is used if
 # 'user-manual-online' is enabled.  This is a string value.
 # 
-# (user-manual-online-uri "http://docs.gimp.org/2.10";)
+# (user-manual-online-uri "https://docs.gimp.org/2.10";)
 
 # The window type hint that is set on dock windows and the toolbox window.
 # This may affect the way your window manager decorates and handles these