fixed typos in JavaDoc

Conflicts:
	src/main/groovy/transform/stc/FromString.java
	src/main/org/codehaus/groovy/classgen/asm/sc/StaticTypesClosureWriter.java

Conflicts:
	subprojects/groovy-xml/src/main/java/groovy/util/slurpersupport/GPathResult.java
replaced local vars of type StringBuffer with StringBuilder