diagram-generator: Fix typos in documentation (#228)

Author: postylem

diagram-generator/README.md

@@ -161,7 +161,7 @@ final image data in a temporary file with the correct format. In case you use
 matplotlib for a diagram, add the following line to do so:
 
 ```python
-plt.savefig("$DESTINATION$", dpi=300, fomat="$FORMAT$")
+plt.savefig("$DESTINATION$", dpi=300, format="$FORMAT$")
 ```
 
 The placeholder `$FORMAT$` gets replace by the necessary format. Most of the
@@ -202,7 +202,7 @@ cxy, f = axs[1].cohere(s1, s2, 256, 1. / dt)
 axs[1].set_ylabel('coherence')
 
 fig.tight_layout()
-plt.savefig("$DESTINATION$", dpi=300, fomat="$FORMAT$")
+plt.savefig("$DESTINATION$", dpi=300, format="$FORMAT$")
 ```
 ~~~~~~~~~~~~~~~~
 

diagram-generator/sample.md

@@ -155,7 +155,7 @@ final image data in a temporary file with the correct format. In case you use
 matplotlib for a diagram, add the following line to do so:
 
 ```python
-plt.savefig("$DESTINATION$", dpi=300, fomat="$FORMAT$")
+plt.savefig("$DESTINATION$", dpi=300, format="$FORMAT$")
 ```
 
 The placeholder `$FORMAT$` gets replace by the necessary format. Most of the
@@ -195,7 +195,7 @@ cxy, f = axs[1].cohere(s1, s2, 256, 1. / dt)
 axs[1].set_ylabel('coherence')
 
 fig.tight_layout()
-plt.savefig("$DESTINATION$", dpi=300, fomat="$FORMAT$")
+plt.savefig("$DESTINATION$", dpi=300, format="$FORMAT$")
 ```
 
 Precondition to use Python is a Python environment which contains all