doc: added more hints as comments to installation commands.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

Author: SmirnovW

README.markdown

@@ -298,6 +298,12 @@ Build the source with this module:
          --add-module=/path/to/ngx_devel_kit \
          --add-module=/path/to/lua-nginx-module
 
+ # Note that you may also want to add `./configure` options which are used in your
+ # current nginx build.
+ # You can get usually those options using command nginx -V
+
+ # you can change the parallism number 2 below to fit the number of spare CPU cores in your
+ # machine.
  make -j2
  make install
 ```

doc/HttpLuaModule.wiki

@@ -231,6 +231,12 @@ Build the source with this module:
             --add-module=/path/to/ngx_devel_kit \
             --add-module=/path/to/lua-nginx-module
 
+    # Note that you may also want to add `./configure` options which are used in your
+    # current nginx build.
+    # You can get usually those options using command nginx -V
+
+    # you can change the parallism number 2 below to fit the number of spare CPU cores in your
+    # machine.
     make -j2
     make install
 </geshi>