[patch] Fix comment typos in std_valarray.h

[Gabriel Dos Reis]

Volker Reichelt <reichelt@igpm.rwth-aachen.de> writes:

| The following patch fixes several comment typos in std_valarray.h:
| 
| Ok for mainline?

Yes.

|         *  Assign elements of array to values in @a v.  Results are undefined
| -       *  if @a v is not the same size as this array.
| +       *  if @a v has not the same size as this array.

I guess, that was supposed to read "if @a v is not of the same size...."
but, you version is fine too.

-- Gaby