Fix name of spawnIsolate to spawn.

docs/language/dartLangSpec.tex

Index: docs/language/dartLangSpec.tex
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--- docs/language/dartLangSpec.tex	(revision 42554)
+++ docs/language/dartLangSpec.tex	(working copy)
@@ -3450,7 +3450,7 @@
 \LMLabel{spawningAnIsolate}
 
 \LMHash{}
-Spawning an isolate is accomplished via what is syntactically an ordinary library call, invoking one of the functions \code{spawnUri()} or \code{spawnFunction()}defined in the \code{dart:isolate} library. However, such calls  have the  semantic effect of creating a new isolate with its own memory and thread of control.
+Spawning an isolate is accomplished via what is syntactically an ordinary library call, invoking one of the functions \code{spawnUri()} or \code{spawn()} defined in the \code{dart:isolate} library. However, such calls  have the  semantic effect of creating a new isolate with its own memory and thread of control.
 
 \LMHash{}
 An isolate's memory is finite, as is the space available to its thread's call stack. It is possible for a running isolate to exhaust its memory or stack, resulting in a run-time error that cannot be effectively caught, which will force the isolate to be suspended.