Fix 2 typos in documentation of libstdc++.

	PR libstdc++/93478
	* include/std/atomic: Fix typo.
	* include/std/optional: Likewise.

libstdc++-v3/ChangeLog

+2020-01-28  Martin Liska  <mliska@suse.cz>
+
+	PR libstdc++/93478
+	* include/std/atomic: Fix typo.
+	* include/std/optional: Likewise.
+
 2020-01-27  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* configure: Regenerate.

libstdc++-v3/include/std/atomic

@@ -174,7 +174,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /**
    *  @brief Generic atomic type, primary class template.
    *
-   *  @tparam _Tp  Type to be made atomic, must be trivally copyable.
+   *  @tparam _Tp  Type to be made atomic, must be trivially copyable.
    */
   template<typename _Tp>
     struct atomic

libstdc++-v3/include/std/optional

@@ -453,7 +453,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     * Such a separate base class template is necessary in order to
     * conditionally make copy/move constructors trivial.
     *
-    * When the contained value is trivally copy/move constructible,
+    * When the contained value is trivially copy/move constructible,
     * the copy/move constructors of _Optional_base will invoke the
     * trivial copy/move constructor of _Optional_payload. Otherwise,
     * they will invoke _Optional_payload(bool, const _Optional_payload&)