[PATCH] [doc] Update obsolete text about sub-blocks

[Tom Tromey <tromey@adacore.com>]

The manual claims that there is no way to iterate over the sub-blocks
of a gdb.Block, but this hasn't been true since commit 5166ed9c
("gdb/python: add subblocks property to gdb.Block").

This patch removes the obsolete clause and rewords the paragraph.
---
 gdb/doc/python.texi | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi
index 6cafab78d58..663976f1877 100644
--- a/gdb/doc/python.texi
+++ b/gdb/doc/python.texi
@@ -6273,10 +6273,9 @@ The block nested just inside the global block is the @dfn{static
 block}.  The static block typically holds file-scoped variables and
 functions.
 
-@value{GDBN} provides a method to get a block's superblock, but there
-is currently no way to examine the sub-blocks of a block, or to
-iterate over all the blocks in a symbol table (@pxref{Symbol Tables In
-Python}).
+There is currently no way to iterate over all the blocks in a symbol
+table (@pxref{Symbol Tables In Python}), but once a block is found,
+its super- and sub-blocks can be iterated over.
 
 Here is a short example that should help explain blocks:
 

base-commit: 2ea3f3a7ac2dd6ccd42e96d496b56aa42e7cb993
-- 
2.54.0