Merge pull request #109 from alhirzel/fix-pahse-typo

fix typo - s/pahse/phase/

Author: baggepinnen

docs/src/index.md

@@ -245,7 +245,7 @@ A video tutorial on how to perform robustness analysis using the diskmargin is a
 
 
 ### Diskmargin example
-The diskmargin can be visualized in several ways, as a region of allowed simultaneous gain and pahse variations:
+The diskmargin can be visualized in several ways, as a region of allowed simultaneous gain and phase variations:
 ```@example diskmargin
 using RobustAndOptimalControl, ControlSystemsBase, Plots
 L = tf(25, [1,10,10,10])

src/diskmargin.jl

@@ -79,7 +79,7 @@ end
 """
     Disk
 
-Represents a perturbation disc in the complex plane. `Disk(0.5, 2)` represents all perturbations in the circle centered at 1.25 with radius 0.75, or in other words, a gain margin of 2 and a pahse margin of 36.9 degrees.
+Represents a perturbation disc in the complex plane. `Disk(0.5, 2)` represents all perturbations in the circle centered at 1.25 with radius 0.75, or in other words, a gain margin of 2 and a phase margin of 36.9 degrees.
 
 A disk can be converted to a Nyquist exclusion disk by `nyquist(disk)` and plotted using `plot(disk)`.
 
@@ -526,4 +526,4 @@ function to1series(x::AbstractVector, y)
     y2 = vec([y; fill(Inf, 1, c)])
     x2 = repeat([x; Inf], c)
     x2,y2
-end
+end