docs: update vimdocs

Author: saghen

doc/blink-cmp.txt

@@ -223,6 +223,41 @@ This can vary by config, but in general for nvim-lspconfig:
 <
 
 
+MERGING LSP CAPABILITIES
+
+Blink.cmp’s `get_lsp_capabilities` function includes the built-in LSP
+capabilities by default. To merge with your own capabilities, use the first
+argument, which acts as an override.
+
+>lua
+    local capabilities = {
+      textDocument = {
+        foldingRange = {
+          dynamicRegistration = false,
+          lineFoldingOnly = true
+        }
+      }
+    }
+    
+    capabilities = require('blink.cmp').get_lsp_capabilities(capabilities)
+    
+    -- or equivalently
+    
+    local capabilities = vim.lsp.protocol.make_client_capabilities()
+    
+    capabilities = vim.tbl_deep_extend('force', capabilities, require('blink.cmp').get_lsp_capabilities({}, false))
+    
+    capabilities = vim.tbl_deep_extend('force', {
+      textDocument = {
+        foldingRange = {
+          dynamicRegistration = false,
+          lineFoldingOnly = true
+        }
+      }
+    })
+<
+
+
 MINI.DEPS                                   *blink-cmp-installation-mini.deps*
 
 The following section includes only the installation and, optionally, building