chore: fix stale metadata and broken npm script

- remove the downport script which references the non-existent
  .github/abaplint/abap_702.jsonc config
- fix typo in package description: managment -> management
- improve Z2UI5_T_13 table description: variants heads -> variant headers
- normalize blank lines between methods in z2ui5_cl_sel_screen

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014yy9ZjmgSF6UabP6mqfSLz

Author: claude

package.json

@@ -5,7 +5,6 @@
   "description": "Selection-Screens, Ranges, Filter and Variant Management for abap2UI5.",
   "scripts": {
     "syfixes": "find . -type f -name '*.abap' -exec sed -i -e 's/ RAISE EXCEPTION TYPE cx_sy_itab_line_not_found/ ASSERT 1 = 0/g' {} + ",
-    "downport": "abaplint --fix .github/abaplint/abap_702.jsonc && npm run syfixes",
     "rename": "abaplint .github/abaplint/rename.json --rename"
   },
   "repository": {

src/01/package.devc.xml

@@ -3,7 +3,7 @@
  <asx:abap xmlns:asx="http://www.sap.com/abapxml" version="1.0">
   <asx:values>
    <DEVC>
-    <CTEXT>variant managment</CTEXT>
+    <CTEXT>variant management</CTEXT>
    </DEVC>
   </asx:values>
  </asx:abap>

src/01/z2ui5_cl_sel_screen.clas.abap

@@ -63,6 +63,7 @@ CLASS z2ui5_cl_sel_screen IMPLEMENTATION.
 
   ENDMETHOD.
 
+
   METHOD factory_selscreen.
 
     result = z2ui5_cl_sel_screen_sel=>factory( val ).

src/01/z2ui5_t_13.tabl.xml

@@ -6,7 +6,7 @@
     <TABNAME>Z2UI5_T_13</TABNAME>
     <DDLANGUAGE>E</DDLANGUAGE>
     <TABCLASS>TRANSP</TABCLASS>
-    <DDTEXT>variants heads</DDTEXT>
+    <DDTEXT>variant headers</DDTEXT>
     <MASTERLANG>E</MASTERLANG>
     <CONTFLAG>A</CONTFLAG>
     <EXCLASS>1</EXCLASS>