direct crossreferences for 'shopt'

[Benno Schulenberg]

Hi,

When doing 'info bash' and Enter, followed by '/shopt' and  twice 
Enter, one ends up in the middle of the description of 'declare', 
instead of at the top of the page.  Apparently texinfo contains a 
bug: when a node contains a reference to itself, any reference 
jumps to that reference instead of to the top of the node.

Anyway, the Bash Builtin Commands node is so big, it seems more 
useful to make each reference to one of its commands go directly to 
that command instead of dropping the user at the top of the node.  
Attached patch does this for the 'shopt' command.  In doing so it 
removes the self reference of the node, so that other references to 
Bash Builtins now go to the top of the page.

If this seems like a good idea, I can make anchors for the other 
references to this node too.

Benno

bash--shopt-crossreference.patch
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