HADOOP-15568. fix some typos in the .sh comments. Contributed by Steve Loughran.

hadoop-common-project/hadoop-common/src/main/conf/hadoop-env.sh

@@ -88,7 +88,7 @@
 # Extra Java runtime options for all Hadoop commands. We don't support
 # IPv6 yet/still, so by default the preference is set to IPv4.
 # export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true"
-# For Kerberos debugging, an extended option set logs more invormation
+# For Kerberos debugging, an extended option set logs more information
 # export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true -Dsun.security.krb5.debug=true -Dsun.security.spnego.debug"
 
 # Some parts of the shell code may do special things dependent upon
@@ -120,9 +120,9 @@ esac
 #
 # By default, Apache Hadoop overrides Java's CLASSPATH
 # environment variable.  It is configured such
-# that it sarts out blank with new entries added after passing
+# that it starts out blank with new entries added after passing
 # a series of checks (file/dir exists, not already listed aka
-# de-deduplication).  During de-depulication, wildcards and/or
+# de-deduplication).  During de-deduplication, wildcards and/or
 # directories are *NOT* expanded to keep it simple. Therefore,
 # if the computed classpath has two specific mentions of
 # awesome-methods-1.0.jar, only the first one added will be seen.

hadoop-common-project/hadoop-common/src/main/conf/hadoop-metrics2.properties

@@ -47,7 +47,7 @@
 #*.sink.ganglia.dmax=jvm.metrics.threadsBlocked=70,jvm.metrics.memHeapUsedM=40
 
 # Tag values to use for the ganglia prefix. If not defined no tags are used.
-# If '*' all tags are used. If specifiying multiple tags separate them with 
+# If '*' all tags are used. If specifying multiple tags separate them with
 # commas. Note that the last segment of the property name is the context name.
 #
 # A typical use of tags is separating the metrics by the HDFS rpc port