Changes table names to headings in the Overview

Table names changed for headings by comment
Fixes #5117

Author: AArdeev

doc/reference/reference_lua/popen.rst

@@ -32,7 +32,9 @@ object:
 
 Below are tables with summaries of ``popen`` constructors, constants, mrthods, and fields.
 
-Popen module constructors:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                      popen module constructors
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 ..  container:: table
 
@@ -49,7 +51,9 @@ Popen module constructors:
     | <popen-new>`                         | a new process                   |
     +--------------------------------------+---------------------------------+
 
-Popen module constants:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                      popen module constants
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 ..  container:: table
 
@@ -63,7 +67,9 @@ Popen module constants:
     | <popen-constants>`                   |                                 |
     +--------------------------------------+---------------------------------+
 
-Popen handle methods:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                      popen module methods
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 ..  container:: table
 
@@ -101,7 +107,9 @@ Popen handle methods:
     | <popen-close>`                       |                                 |
     +--------------------------------------+---------------------------------+
 
-Popen handle fields:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                      popen module fields
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 ..  container:: table