Merge pull request #815 from montoyamoraga/patch-1

fix typo in reference page of filter()

Author: REAS

content/api_en/PImage_filter.xml

@@ -156,7 +156,7 @@ POSTERIZE<br />
 Limits each channel of the image to the number of colors specified as the parameter. The parameter can be set to values between 2 and 255, but results are most noticeable in the lower ranges.<br />
 <br />
 BLUR<br />
-Executes a Guassian blur with the level parameter specifying the extent of the blurring. If no parameter is used, the blur is equivalent to Guassian blur of radius 1. Larger values increase the blur.<br />
+Executes a Gaussian blur with the level parameter specifying the extent of the blurring. If no parameter is used, the blur is equivalent to Gaussian blur of radius 1. Larger values increase the blur.<br />
 <br />
 ERODE<br />
 Reduces the light areas. No parameter is used.<br />