doc typos

pkgs/racket-doc/scribblings/reference/strings.scrbl

@@ -91,7 +91,7 @@ Returns an immutable string with the same content as
  characters long, and that contains the same characters as
  @racket[str] from @racket[start] inclusive to @racket[end] exclusive.
  The first position in a string corresponds to @racket[0], so
- the @racket[start] and @racket[end] arguments so they must be less than or
+ the @racket[start] and @racket[end] arguments must be less than or
  equal to the length of @racket[str], and @racket[end] must be greater
  than or equal to @racket[start], otherwise the
  @exnraise[exn:fail:contract].

pkgs/racket-doc/scribblings/style/unit.scrbl

@@ -482,7 +482,7 @@ mutually recursive functions with modules. This capability is unique to
 @image["mut-rec-contracts.png" #:scale .8]{Mutually recursive functions with contracts}
 
 In contrast, submodules act exactly like plain modules when it comes to
-contract boundaries. Like @racket[define/contract], a submodue establishes
+contract boundaries. Like @racket[define/contract], a submodule establishes
 a contract boundary between itself and the rest of the module. Any value
 flow between a client module and the submodule is governed by
 contracts. Any value flow within the submodule is free of any constraints.

pkgs/racket-doc/syntax/scribblings/parse/stxclasses.scrbl

@@ -134,7 +134,7 @@ pattern}.
 @defform*[#:literals (pattern)
           [(define-splicing-syntax-class name-id stxclass-option ...
              stxclass-variant ...+)
-           (define-splicing-syntax-class (name-id kw-formals) stxclass-option ... 
+           (define-splicing-syntax-class (name-id . kw-formals) stxclass-option ... 
              stxclass-variant ...+)]]{
 
 Defines @racket[name-id] as a @deftech{splicing syntax class},