fix: capture inline description for keywords like Host and User

Problem: keywords with description text on the same line (e.g.
"Host    Restricts the following...") had their first line of
documentation silently dropped because the parser started collecting
at the line after the keyword.

Solution: extract trailing text from the keyword line and prepend it
to the description block.

spec/ssh_spec.lua

@@ -146,6 +146,21 @@ describe('blink-cmp-ssh', function()
       assert.is_truthy(strict.documentation.value:find('known_hosts'))
     end)
 
+    it('includes inline description for keywords with text on the same line', function()
+      restores[#restores + 1] = mock_system()
+      local source = require('blink-cmp-ssh').new()
+      local items
+      source:get_completions({ line = '', cursor = { 1, 0 } }, function(response)
+        items = response.items
+      end)
+      local host = vim.iter(items):find(function(item)
+        return item.label == 'Host'
+      end)
+      assert.is_not_nil(host)
+      assert.is_not_nil(host.documentation)
+      assert.is_truthy(host.documentation.value:find('Restricts'))
+    end)
+
     it('returns enum values after a known keyword', function()
       restores[#restores + 1] = mock_system()
       local source = require('blink-cmp-ssh').new()