Jdk7 internal and external build README files need to be updated to include the lastest instructions on how to build OpenJDK.

Latest change: ALT_BUILD_JDK_IMPORT_PATH and ALT_BUILD_BINARY_PLUGS_PATH vars were introduced instead of old ALT_CLOSED_BUILD_PATH, ALT_CLOSED_LIB_DIR vars (see cr 6591759).

However, Jdk7 build README instructions have not been updated.

- src/closed/share/doc/build/README-internal.html
OpenJDK section still talks about setting of old ALT_CLOSED_BUILD_PATH, ALT_CLOSED_LIB_DIR vars that do not exist anymore.
http://javaweb.sfbay/jcg/ws/7/MASTER/src/closed/share/doc/build/README-internal.html#openjdk

- src/closed/share/doc/build/README-builds.html
The new var ALT_BUILD_BINARY_PLUGS_PATH should be described somewhere in this doc.
Found a few minor issues in build README document (FIXME sections and a few typos):
File: src/closed/share/doc/build/README-builds.html.html

http://javaweb.sfbay.sun.com/~ohair/webrevs/my_jdk7set/j2se-2007.08.17-1/src/closed/share/doc/build/README-builds.html.html

1) SECURITY_BASELINE_142   "FIXME:"
1723 <B>FIXME: Need more words here as to what this is for.</B>
1724 The version corresponding to the latest publicly available

2)  SECURITY_BASELINE_150
1730 <B>FIXME: Need more words here as to what this is for.</B>
1731 The version corresponding to the latest publicly available

3) Typo: "Enviroment"
1747 It is possible to build the Java 2 Runtime Enviroment instead of the full

4) Typo: "To peform"
1748 JDK. To peform a JRE only build, set the variable J2RE_ONLY

5) Typo: "descibed"
1784 Some of the more common problems with builds are briefly descibed
*** (#1 of 1): 2007-08-27 15:31:23 PDT ###@###.###