documentation: clean up a minor syntax issue.
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@@ -855,7 +855,7 @@ extern SDL_DECLSPEC int SDLCALL SDL_isgraph(int x);
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* cannot be converted, or is already uppercase, this function returns `x`.
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*
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* \param x character value to check.
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* \returns Capitalized version of x, or x if no conversion available.
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* \returns capitalized version of x, or x if no conversion available.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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@@ -873,7 +873,7 @@ extern SDL_DECLSPEC int SDLCALL SDL_toupper(int x);
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* cannot be converted, or is already lowercase, this function returns `x`.
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*
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* \param x character value to check.
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* \returns Lowercase version of x, or x if no conversion available.
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* \returns lowercase version of x, or x if no conversion available.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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@@ -1077,7 +1077,7 @@ extern SDL_DECLSPEC char *SDLCALL SDL_strrev(char *str);
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* uppercase equivalents in-place, returning the original `str` pointer.
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*
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* \param str The string to convert in-place. Can not be NULL.
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* \returns The `str` pointer passed into this function.
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* \returns the `str` pointer passed into this function.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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@@ -1098,7 +1098,7 @@ extern SDL_DECLSPEC char *SDLCALL SDL_strupr(char *str);
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* lowercase equivalents in-place, returning the original `str` pointer.
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*
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* \param str The string to convert in-place. Can not be NULL.
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* \returns The `str` pointer passed into this function.
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* \returns the `str` pointer passed into this function.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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