Fix some issue with orgtbl-mode

* lisp/org-table.el (orgtbl-send-replace-tbl): Allow multiple spaces between
keywords in RECEIVE ORGTBL lines.
* doc/org.texi (A @LaTeX{} example): Fix typo in variable name.

doc/org.texi

@@ -16782,9 +16782,10 @@ can use Org's facilities to edit and structure lists by turning
 @cindex radio tables
 
 To define the location of the target table, you first need to create two
-lines that are comments in the current mode, but contain magic words for
-Orgtbl mode to find.  Orgtbl mode will insert the translated table
-between these lines, replacing whatever was there before.  For example:
+lines that are comments in the current mode, but contain magic words
+@code{BEGIN/END RECEIVE ORGTBL} for Orgtbl mode to find.  Orgtbl mode will
+insert the translated table between these lines, replacing whatever was there
+before.  For example in C mode where comments are between @code{/* ... */}:
 
 @example
 /* BEGIN RECEIVE ORGTBL table_name */
@@ -16858,7 +16859,7 @@ The best way to wrap the source table in @LaTeX{} is to use the
 activated by placing @code{\usepackage@{comment@}} into the document
 header.  Orgtbl mode can insert a radio table skeleton@footnote{By
 default this works only for @LaTeX{}, HTML, and Texinfo.  Configure the
-variable @code{orgtbl-radio-tables} to install templates for other
+variable @code{orgtbl-radio-table-templates} to install templates for other
 modes.}  with the command @kbd{M-x orgtbl-insert-radio-table RET}.  You will
 be prompted for a table name, let's say we use @samp{salesfigures}.  You
 will then get the following template:

lisp/org-table.el

@@ -4399,14 +4399,14 @@ a radio table."
   (save-excursion
     (goto-char (point-min))
     (unless (re-search-forward
-	     (concat "BEGIN RECEIVE ORGTBL +" name "\\([ \t]\\|$\\)") nil t)
+	     (concat "BEGIN +RECEIVE +ORGTBL +" name "\\([ \t]\\|$\\)") nil t)
       (user-error "Don't know where to insert translated table"))
     (goto-char (match-beginning 0))
     (beginning-of-line 2)
     (save-excursion
       (let ((beg (point)))
 	(unless (re-search-forward
-		 (concat "END RECEIVE ORGTBL +" name) nil t)
+		 (concat "END +RECEIVE +ORGTBL +" name) nil t)
 	  (user-error "Cannot find end of insertion region"))
 	(beginning-of-line 1)
 	(delete-region beg (point))))