docs: update vimdocs

Author: Saghen

doc/blink-cmp.txt

@@ -1,4 +1,4 @@
-*blink-cmp.txt*         For NVIM v0.10.0         Last change: 2025 February 25
+*blink-cmp.txt*         For NVIM v0.10.0         Last change: 2025 February 26
 
 ==============================================================================
 Table of Contents                                *blink-cmp-table-of-contents*
@@ -1810,6 +1810,12 @@ COMPLETION MENU DRAW
           text = function(ctx) return ctx.source_name end,
           highlight = 'BlinkCmpSource',
         },
+    
+        source_id = {
+          width = { max = 30 },
+          text = function(ctx) return ctx.source_id end,
+          highlight = 'BlinkCmpSource',
+        },
       },
     },
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