[DOC] Update some outdated links

## What changes were proposed in this pull request?

These links are outdated:
 - http://spark.apache.org/docs/latest/building-spark.html#specifying-the-hadoop-version
 - http://spark.apache.org/docs/latest/building-spark.html#building-with-buildmvn

Fix files which use these links.

Closes apache#22321 from kisimple/docfix.

Authored-by: blueszheng <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: blueszheng

R/README.md

@@ -17,7 +17,7 @@ export R_HOME=/home/username/R
 
 #### Build Spark
 
-Build Spark with [Maven](http://spark.apache.org/docs/latest/building-spark.html#building-with-buildmvn) and include the `-Psparkr` profile to build the R package. For example to use the default Hadoop versions you can run
+Build Spark with [Maven](http://spark.apache.org/docs/latest/building-spark.html#buildmvn) and include the `-Psparkr` profile to build the R package. For example to use the default Hadoop versions you can run
 
 ```bash
 build/mvn -DskipTests -Psparkr package

R/WINDOWS.md

@@ -14,7 +14,7 @@ directory in Maven in `PATH`.
 
 4. Set `MAVEN_OPTS` as described in [Building Spark](http://spark.apache.org/docs/latest/building-spark.html).
 
-5. Open a command shell (`cmd`) in the Spark directory and build Spark with [Maven](http://spark.apache.org/docs/latest/building-spark.html#building-with-buildmvn) and include the `-Psparkr` profile to build the R package. For example to use the default Hadoop versions you can run
+5. Open a command shell (`cmd`) in the Spark directory and build Spark with [Maven](http://spark.apache.org/docs/latest/building-spark.html#buildmvn) and include the `-Psparkr` profile to build the R package. For example to use the default Hadoop versions you can run
 
     ```bash
     mvn.cmd -DskipTests -Psparkr package

README.md

@@ -90,7 +90,7 @@ storage systems. Because the protocols have changed in different versions of
 Hadoop, you must build Spark against the same version that your cluster runs.
 
 Please refer to the build documentation at
-["Specifying the Hadoop Version"](http://spark.apache.org/docs/latest/building-spark.html#specifying-the-hadoop-version)
+["Specifying the Hadoop Version and Enabling YARN"](http://spark.apache.org/docs/latest/building-spark.html#specifying-the-hadoop-version-and-enabling-yarn)
 for detailed guidance on building for a particular distribution of Hadoop, including
 building for particular Hive and Hive Thriftserver distributions.