Trivial comment misspelling in libstdc++ specfun.h

[Ed Smith-Rowland]

Committed as obvious.

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2016-04-17  Edward Smith-Rowland  <3dw4rd@verizon.net>

	* include/bits/specfun.h: Trivial comment misspelling.

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Index: include/bits/specfun.h
===================================================================
--- include/bits/specfun.h	(revision 235086)
+++ include/bits/specfun.h	(working copy)
@@ -126,7 +126,7 @@
    * @subsection promotion Argument Promotion
    * The arguments suppled to the non-suffixed functions will be promoted
    * according to the following rules:
-   * 1. If any argument intended to be floating opint is given an integral value
+   * 1. If any argument intended to be floating point is given an integral value
    * That integral value is promoted to double.
    * 2. All floating point arguments are promoted up to the largest floating
    *    point precision among them.