Documentation update (#1573)

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

docs/01.GETTING-STARTED.md

@@ -45,10 +45,10 @@ python tools/build.py --debug --lto=off
 python tools/build.py --cmake-param=CMAKE_PARAM
 ```
 
-**Set a profile mode (full, minimal)**
+**Set a profile mode (ES5.1, subset of ES2015, minimal)**
 
 ```bash
-python tools/build.py --feature=full|minimal
+python tools/build.py --profile=es5.1|es2015-subset|minimal
 ```
 
 **Use (jerry, compiler-default, external) libc**
@@ -81,6 +81,37 @@ For example the cross-compile to RaspberryPi 2 is something like this:
 python tools/build.py --toolchain=cmake/toolchain_linux_armv7l.cmake
 ```
 
+**Use system memory allocator**
+
+```bash
+python tools/build.py --system-allocator=on --jerry-libc=off
+```
+
+*Note*: System allocator is only supported on 32 bit systems.
+
+**Enable 32bit compressed pointers**
+
+```bash
+python tools/build.py --cpointer-32bit=on
+```
+
+*Note*: There is no compression/decompression on 32 bit systems, if enabled.
+
+**Change default heap size (512K)**
+
+```bash
+python tools/build.py --mem-heap=256
+```
+
+If you would like to use more than 512K, then you must enable the 32 bit compressed pointers.
+
+```bash
+python tools/build.py --cpointer-32bit=on --mem-heap=1024
+```
+
+*Note*: The heap size will be allocated statically at compile time, when JerryScript memory
+allocator is used.
+
 **To get a list of all the available buildoptions for Linux**
 
 ```bash