Update the texinfo for link parameters documentation

doc/org.texi

@@ -3688,6 +3688,7 @@ entry referenced by the current line.
 @cindex completion, of links
 @cindex inserting links
 @vindex org-keep-stored-link-after-insertion
+@vindex org-link-parameters
 Insert a link@footnote{Note that you don't have to use this command to
 insert a link.  Links in Org are plain text, and you can type or paste them
 straight into the buffer.  By using this command, the links are automatically
@@ -3711,11 +3712,12 @@ them with @key{up} and @key{down} (or @kbd{M-p/n}).
 valid link prefixes like @samp{http:} or @samp{ftp:}, including the prefixes
 defined through link abbreviations (@pxref{Link abbreviations}).  If you
 press @key{RET} after inserting only the @var{prefix}, Org will offer
-specific completion support for some link types@footnote{This works by
-calling a special function @code{org-PREFIX-complete-link}.}  For
-example, if you type @kbd{file @key{RET}}, file name completion (alternative
-access: @kbd{C-u C-c C-l}, see below) will be offered, and after @kbd{bbdb
-@key{RET}} you can complete contact names.
+specific completion support for some link types@footnote{This works if
+a completion function is defined in the @samp{:complete} property of a link
+in @code{org-link-parameters}.}  For example, if you type @kbd{file
+@key{RET}}, file name completion (alternative access: @kbd{C-u C-c C-l}, see
+below) will be offered, and after @kbd{bbdb @key{RET}} you can complete
+contact names.
 @orgkey C-u C-c C-l
 @cindex file name completion
 @cindex completion, of file names
@@ -3887,10 +3889,15 @@ can define them in the file with
 
 @noindent
 In-buffer completion (@pxref{Completion}) can be used after @samp{[} to
-complete link abbreviations.  You may also define a function
-@code{org-PREFIX-complete-link} that implements special (e.g., completion)
-support for inserting such a link with @kbd{C-c C-l}.  Such a function should
-not accept any arguments, and return the full link with prefix.
+complete link abbreviations.  You may also define a function that implements
+special (e.g., completion) support for inserting such a link with @kbd{C-c
+C-l}.  Such a function should not accept any arguments, and return the full
+link with prefix.  You can add a completion function to a link like this:
+
+@lisp
+(org-link-set-parameters ``type'' :complete #'some-function)
+@end lisp
+
 
 @node Search options
 @section Search options in file links
@@ -18005,9 +18012,9 @@ the link description when the link is later inserted into an Org
 buffer with @kbd{C-c C-l}.
 
 When it makes sense for your new link type, you may also define a function
-@code{org-PREFIX-complete-link} that implements special (e.g., completion)
-support for inserting such a link with @kbd{C-c C-l}.  Such a function should
-not accept any arguments, and return the full link with prefix.
+that implements special (e.g., completion) support for inserting such a link
+with @kbd{C-c C-l}.  Such a function should not accept any arguments, and
+return the full link with prefix.
 
 @node Adding export back-ends
 @section Adding export back-ends