doc: remove the section about share-safe from its verbose gating stable

doc: remove the section about share-safe from its verbose gating

The feature is no longer experimental.

Differential Revision: https://phab.mercurial-scm.org/D9838

--- a/mercurial/helptext/config.txt	Wed Jan 20 12:08:10 2021 +0100
+++ b/mercurial/helptext/config.txt	Wed Jan 20 12:11:41 2021 +0100
@@ -147,14 +147,12 @@
 merge tool configuration but packagers can also put other default configuration
 there.
 
-.. container:: verbose
-
-    On versions 5.7 and later, if share-safe functionality is enabled,
-    shares will read config file of share source too.
-    `<share-source/.hg/hgrc>` is read before reading `<repo/.hg/hgrc>`.
-
-    For configs which should not be shared, `<repo/.hg/hgrc-not-shared>`
-    should be used.
+On versions 5.7 and later, if share-safe functionality is enabled,
+shares will read config file of share source too.
+`<share-source/.hg/hgrc>` is read before reading `<repo/.hg/hgrc>`.
+
+For configs which should not be shared, `<repo/.hg/hgrc-not-shared>`
+should be used.
 
 Syntax
 ======