Fix doc typos

collects/scribblings/guide/performance.scrbl

@@ -299,7 +299,7 @@ important advantages of the @tech{JIT} compiler. For example, when
 @racket[+] is applied to two arguments, the generated machine code
 tests whether the two arguments are fixnums, and if so, it uses the
 machine's instruction to add the numbers (and check for overflow). If
-the two numbers are not fixnums, then it checks whether whether
+the two numbers are not fixnums, then it checks whether
 both are flonums; in that case, the machine's floating-point
 operations are used directly. For functions that take any number of
 arguments, such as @racket[+], inlining works for two or more

collects/scribblings/guide/regexp.scrbl

@@ -525,7 +525,7 @@ enclosed subpattern as an entity:
 
 @interaction[
 #:eval rx-eval
-(regexp-match #rx"(poo )*" "poo poo platter")
+(regexp-match #rx"(pu )*" "pu pu platter")
 ]
 
 The number of submatches returned is always equal to the number of

collects/scribblings/raco/launcher.scrbl

@@ -69,7 +69,7 @@ For Unix/X, the script created by @racket[make-mred-launcher] detects
 and handles X Windows flags specially when they appear as the initial
 arguments to the script. Instead of appending these arguments to the
 end of @racket[args], they are spliced in after any X Windows flags
-already listed listed in @racket[args]. The remaining arguments (i.e.,
+already listed in @racket[args]. The remaining arguments (i.e.,
 all script flags and arguments after the last X Windows flag or
 argument) are then appended after the spliced @racket[args].}
 

collects/scribblings/raco/setup.scrbl

@@ -291,7 +291,7 @@ Optional @filepath{info.rkt} fields trigger additional actions by
    ]
 
    is provided for the optional @racket[_aux] argument (for icons,
-   etc.) to @racket[make-racket-launcher], where where
+   etc.) to @racket[make-racket-launcher], where
    @nonterm{suffixless-file} is @nonterm{file} without its suffix.
 
    If @racket[racket-launcher-flags] is provided, it is used as a
@@ -539,7 +539,7 @@ form.}
   
 @defparam[specific-collections colls (listof (listof path-string?))]{
   A list of collections to set up; the empty list means set-up all
-  collections if the archives list and @racket[specific-planet-dirs] is
+  collections if the archives list and @racket[specific-planet-dirs]
   is also @racket['()]. @defaults[@racket['()]]}
 
   @defparam[specific-planet-dirs dir (listof (list/c string?

collects/scribblings/scribble/how-to.scrbl

@@ -374,6 +374,6 @@ Latex output.
 When using @racket[local-table-of-contents], it often makes sense to
 include introductory text before the call of
 @racket[local-table-of-contents]. When the introductory text is less
-important and when when local table of contents is short, putting the
+important and when local table of contents is short, putting the
 introductory text after the call of @racket[local-table-of-contents]
 may be appropriate.

collects/scribblings/scribble/manual.scrbl

@@ -185,7 +185,7 @@ produces the typeset result
               ([maybe-escape code:blank
                             (code:line #:escape escape-id)])]{
 
-Typesets the @racket[datum] sequence as a table of Racket code inset
+Typesets the @racket[datum] sequence as a table of Racket code
 inset via @racket[nested] with the style @racket['code-inset]. The
 source locations of the @racket[datum]s determine the generated
 layout. For example,
@@ -223,7 +223,7 @@ Like other forms defined via @racket[define-code],
 @tech{element transformers}.
 
 An @racket[#:escape] clause specifies an identifier to escape back to
-an expression that produces produces an @racket[element]. But default,
+an expression that produces an @racket[element]. By default,
 the escape identifier is @racket[unsyntax]. For example,
 
 @racketblock[
@@ -435,7 +435,7 @@ linked, even if it is not an identifier.}
 
 @defproc[(litchar [str string?] ...) element?]{Typesets @racket[str]s as a
 representation of literal text. Use this when you have to talk about
-the individual characters in a stream of text, as as when documenting
+the individual characters in a stream of text, as when documenting
 a reader extension.}
 
 @defproc[(racketfont [pre-content pre-content?] ...) element?]{Typesets
@@ -1226,7 +1226,7 @@ Typesets the given combination of a GUI's menu and item name.}
 
 @defproc[(filepath [pre-content pre-content?] ...) element?]{Typesets the
 @tech{decode}d @racket[pre-content] as a file name (e.g., in
-typewriter font and in in quotes).}
+typewriter font and in quotes).}
 
 @defproc[(exec [pre-content pre-content?] ...) element?]{Typesets the
 @tech{decode}d @racket[pre-content] as a command line (e.g., in

collects/scribblings/scribble/srcdoc.scrbl

@@ -96,7 +96,7 @@ The normal @racket[require]s of the enclosing library are effectively
 converted into @racket[for-label] @racket[require]s when generating
 documentation, so that identifiers in the @racket[contract]s are
 linked to their corresponding documentation. Similarly, any binding
-that is available in the run-time phase of of the enclosing library
+that is available in the run-time phase of the enclosing library
 can be referenced in documentation prose using the @racket[racket]
 form.}