PXB-3440 [DOCS]Document how to build Pro build of PXB (#356)

modified:   docs/compile-xtrabackup.md
modified:   docs/compile-xtrabackup.md

docs/compile-xtrabackup.md

@@ -1,6 +1,3 @@
-<!--- are these instructions current?
-    --->
-
 # Compile and install from source
 
 The following instructions install Percona XtraBackup {{vers}}.
@@ -94,28 +91,33 @@ directory:
     $ cd build
     ```
 
-3. Run cmake or cmake3. In either case, the options you need to use are the
+3. If you use a regular build, run cmake or cmake3. In either case, the options you need to use are the
 same.
 
 !!! note
 
     You can build *Percona XtraBackup* with man pages but this requires
     `python-sphinx` package which isn’t available from that main repositories
     for every distribution. If you installed the `python-sphinx` package you
-    need to remove the `-DWITH_MAN_PAGES=OFF` from previous command.
+    need to remove the `-DWITH_MAN_PAGES=OFF` from the following command.
+
+```{.bash data-prompt="$"}
+$ cmake -DBUILD_CONFIG=xtrabackup_release -DWITH_MAN_PAGES=OFF ..
+```
+
+If you use [Pro builds](./pxb-pro.md), run the following command
 
 ```{.bash data-prompt="$"}
-$ cmake -DWITH_BOOST=PATH-TO-BOOST-LIBRARY -DDOWNLOAD_BOOST=ON \
--DBUILD_CONFIG=xtrabackup_release -DWITH_MAN_PAGES=OFF -B ..
+$ cmake -DPROBUILD=1 -DBUILD_CONFIG=xtrabackup_release -DWITH_MAN_PAGES=OFF ..
 ```
 
 ### Parameter Information
 
-| **Parameter** | **Description** |
+| Parameter | Description |
 |---------------|-----------------|
-| `-DWITH_BOOST` | For the `-DWITH_BOOST` parameter, specify the name of a directory to download the boost library to. This directory is created automatically in your current directory. |
-| `-DWITH_MAN_PAGES` | To build **Percona XtraBackup** man pages, use `ON` or remove this parameter from the command line (it is `ON` by default). To install the man pages, install the python3-sphinx package first. |
-| `-B` (--build)| **Percona XtraBackup** is configured to forbid generating the build    pipeline for make in the same directory where you store your sources. The `-B` parameter refers to the directory that contains the source code. In this example, we use the relative path to the parent directory (..). |
+| `-DPROBUILD=1` | This option enables a Pro build. |
+| `-DBUILD_CONFIG` | This option builds a release/optimized version of the xtrabackup binary. |
+| `-DWITH_MAN_PAGES` | To build Percona XtraBackup man pages, use `ON` or remove this parameter from the command line (it is `ON` by default). To install the man pages, install the python3-sphinx package first. |
 
 !!! important