[hackers] [blind] Fix typo || Mattias Andrée

[git]

commit b8a30d699041fe9953b37019913792a7cc2192f7
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Sat Sep 16 23:53:15 2017 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Sat Sep 16 23:53:15 2017 +0200

    Fix typo
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/man/blind-spiral-gradient.1 b/man/blind-spiral-gradient.1
index efd61f3..bf7b935 100644
--- a/man/blind-spiral-gradient.1
+++ b/man/blind-spiral-gradient.1
@@ -35,7 +35,7 @@ modify the shape of the spiral so that it is
 based on a superellipse instead of a circle.
 The first and second channel of third pixel creates
 a vector that is normalised. This vector and its
-normal creates the basis an imaginary coordinate
+normal creates the basis of an imaginary coordinate
 system with its origo at the beginning of the spiral.
 The superellipse defined by the equation
 .RI | x |^ a +| y / m |^ b =1,