lint: Add description check for common typos.

Fixes: https://issues.guix.gnu.org/44675

* guix/lint.scm (check-description-typo): Add check for occurences of
  "This packages", "This modules", "allows to" and "permits to" in package
  descriptions.
* tests/lint.scm: Add tests for "This packages" and "allows to".

guix/lint.scm

@@ -321,6 +321,21 @@ markup is valid return a plain-text version of DESCRIPTION, otherwise #f."
                       (G_ "Texinfo markup in description is invalid")
                       #:field 'description))))
 
+  (define (check-description-typo description typo-corrections)
+    "Check that DESCRIPTION does not contain typo, with optional correction"
+    (append-map
+     (match-lambda
+      ((typo . correction)
+       (if (string-contains description typo)
+           (list
+            (make-warning package
+                          (G_
+                           (format #false
+                                   "description contains typo '~a'~@[, should be '~a'~]"
+                                   typo correction))))
+           '())))
+     typo-corrections))
+
   (define (check-trademarks description)
     "Check that DESCRIPTION does not contain '™' or '®' characters.  See
 http://www.gnu.org/prep/standards/html_node/Trademarks.html."
@@ -401,6 +416,10 @@ by two spaces; possible infraction~p at ~{~a~^, ~}")
          (check-not-empty description)
          (check-quotes description)
          (check-trademarks description)
+         (check-description-typo description '(("This packages" . "This package")
+                                               ("This modules" . "This module")
+                                               ("allows to" . #f)
+                                               ("permits to" . #f)))
          ;; Use raw description for this because Texinfo rendering
          ;; automatically fixes end of sentence space.
          (check-end-of-sentence-space description)

tests/lint.scm

@@ -177,6 +177,20 @@
                               (description "Whitespace. "))))
      (check-description-style pkg))))
 
+(test-equal "description: pluralized 'This package'"
+  "description contains typo 'This packages', should be 'This package'"
+  (single-lint-warning-message
+   (let ((pkg (dummy-package "x"
+                             (description "This packages is a typo."))))
+     (check-description-style pkg))))
+
+(test-equal "description: grammar 'allows to'"
+  "description contains typo 'allows to'"
+  (single-lint-warning-message
+   (let ((pkg (dummy-package "x"
+                             (description "This package allows to do stuff."))))
+     (check-description-style pkg))))
+
 (test-equal "synopsis: not a string"
   "invalid synopsis: #f"
   (single-lint-warning-message