docs: remove incorrect v6 auto prune info

As of npm@7, extraneous modules are always auto pruned

Author: wraithgar

docs/content/using-npm/config.md

@@ -1219,10 +1219,6 @@ The package to install for [`npm exec`](/commands/npm-exec)
 If set to false, then ignore `package-lock.json` files when installing. This
 will also prevent _writing_ `package-lock.json` if `save` is true.
 
-When package package-locks are disabled, automatic pruning of extraneous
-modules will also be disabled. To remove extraneous modules with
-package-locks disabled use `npm prune`.
-
 This configuration does not affect `npm ci`.
 
 <!-- automatically generated, do not edit manually -->

lib/utils/config/definitions.js

@@ -1448,10 +1448,6 @@ define('package-lock', {
     This will also prevent _writing_ \`package-lock.json\` if \`save\` is
     true.
 
-    When package package-locks are disabled, automatic pruning of extraneous
-    modules will also be disabled.  To remove extraneous modules with
-    package-locks disabled use \`npm prune\`.
-
     This configuration does not affect \`npm ci\`.
   `,
   flatten: (key, obj, flatOptions) => {

tap-snapshots/test/lib/utils/config/definitions.js.test.cjs

@@ -1302,10 +1302,6 @@ exports[`test/lib/utils/config/definitions.js TAP > config description for packa
 If set to false, then ignore \`package-lock.json\` files when installing. This
 will also prevent _writing_ \`package-lock.json\` if \`save\` is true.
 
-When package package-locks are disabled, automatic pruning of extraneous
-modules will also be disabled. To remove extraneous modules with
-package-locks disabled use \`npm prune\`.
-
 This configuration does not affect \`npm ci\`.
 `
 

tap-snapshots/test/lib/utils/config/describe-all.js.test.cjs

@@ -1093,10 +1093,6 @@ The package to install for [\`npm exec\`](/commands/npm-exec)
 If set to false, then ignore \`package-lock.json\` files when installing. This
 will also prevent _writing_ \`package-lock.json\` if \`save\` is true.
 
-When package package-locks are disabled, automatic pruning of extraneous
-modules will also be disabled. To remove extraneous modules with
-package-locks disabled use \`npm prune\`.
-
 This configuration does not affect \`npm ci\`.
 
 <!-- automatically generated, do not edit manually -->