fix(markdown): Change optional parameter doc format from man page to JavaScript

markdown/dev/reference/api/path/addtext/en.md

@@ -7,7 +7,7 @@ The `Path.addText()` method adds text to the path.
 ## Signature
 
 ```js
-Path path.addText(string text[, string className])
+Path path.addText(string text, string className = '')
 ```
 
 The second argument will optionally be used to set the CSS class for the text.

markdown/dev/reference/api/path/attr/en.md

@@ -13,8 +13,8 @@ instead, thereby overwriting the value of the attribute.
 ```js
 Path path.attr(
   string name,
-  mixed value[,
-  bool overwrite = false]
+  mixed value,
+  bool overwrite = false
 )
 ```
 

markdown/dev/reference/api/path/join/en.md

@@ -12,7 +12,7 @@ If that's not what you want, you should use
 ## Signature
 
 ```js
-Path path.join(path other[, bool closed=false])
+Path path.join(path other, bool closed = false)
 ```
 
 The second argument will optionally be used to close the joined path.

markdown/dev/reference/api/path/settext/en.md

@@ -7,7 +7,7 @@ The `Path.setText()` method sets text on the path.
 ## Signature
 
 ```js
-Path path.setText(string text[, string className])
+Path path.setText(string text, string className = '')
 ```
 
 The second argument will optionally be used to set the CSS class for the text.

markdown/dev/reference/api/path/shiftalong/en.md

@@ -8,7 +8,7 @@ along the path.
 ## Signature
 
 ```js
-Point path.shiftAlong(float distance[, int stepsPerMm=10])
+Point path.shiftAlong(float distance, int stepsPerMm = 10)
 ```
 
 The second parameter controls the precision by which the path will be _walked_.

markdown/dev/reference/api/path/shiftfractionalong/en.md

@@ -8,7 +8,7 @@ length of the path travelled along the path.
 ## Signature
 
 ```js
-Point path.shiftFractionAlong(float fraction[, int stepsPerMm=25])
+Point path.shiftFractionAlong(float fraction, int stepsPerMm = 25)
 ```
 
 The second parameter controls the precision by which the path will be _walked_.