Corrected the example for WCS raster loading

I changed the example for two reason

1) work on the really demo WCS server offered by mapserver
2) it works :)
3) added reference to URI documentation wrote by Radim in wcs provider
two typos

line 290:  in each color dialog window of the renderes ---> 'renderes' should be 'renderers'

line 292: and paste operations -----> 'operation" should be plural 'operations' since we are talking about 'some copy and paste' (plural)
two typos corrected

line 63: edit Ankorage, because that is a 'Manicpality' --> 'Ankorage' = 'Anchorage" ;  'Manicpality' = 'Municipality'
Multiple changes/typos

line 73 : Just clic on :guilabel:` Save Style` comboxbox and choose  --> 'çlic'  should be 'click' 

line 149: and/or label of the clic, just double clicking on the item you want to -->  'clic' should probably be 'class'
                                                                        -->  'double clicking' should be 'double click'
																		
line 152 : Right-clic shows a contextual menu   ----> 'Right-clic' should be 'Right-click'

line 231 :Right-clic shows a contextual menu   ----> 'Right-clic' should be 'Right-click'

line 319 : As before you can select a subrenderers  ---> 'a' is superfluous. 'subrenderers' is plural and sufficient

line 568 : label (above, belw or on the line), ---------> 'belw' = 'below'

line 625 : Related to the choose of Label Placement  ---> 'choose' should be 'choice'

line 708 : you have hundreds if functions available ---> 'if' should be 'of' 
 
line 719 :  for more information and example on expressions. ----.  'example' should be plural since there are more then one example in the chapter Expressions
 
line 799 : Displays a line fields which can opens a   --->'fields'should be 'field' ; 'can opens' should be 'can open'

line 1329 : See :ref:`vector_expressions` chapter for more information and example. ---> 'example' should be plural since there are more then one example in the chapter Expressions
Corrected some grammar and typo's

line 17 : :guilabel:`Plugins > Manage and install pluginsi ...`.   ---> ' pluginsi' should be  'plugins'
 
line 21:  some plugins updating ------> 'some plugins updating' should be 'some updates for plugins'
typo fixes, thanks to joao gaspar

Signed-off-by: Werner Macho <werner.macho@gmail.com>
Replaced outdated link

The mentioned link was outdated and intended for PostgreSQL 8.3.

added the link to PostgreSQL 9.0
http://www.postgresonline.com/downloads/special_feature/postgresql90_cheatsheet_A4.pdf
Merge pull request #411 from DiGro/patch-2

Replaced outdated link
Merge pull request #410 from DiGro/patch-1

Corrected some grammar and typo's
Merge pull request #409 from DiGro/patch-7

Multiple changes/typos
Merge pull request #408 from DiGro/patch-6

two typos corrected
Merge pull request #407 from DiGro/patch-5

two typos
Merge pull request #405 from luipir/master

Corrected the example for WCS raster loading