Fix documentation typos

documentation/Mat_Rewind.3

@@ -46,7 +46,7 @@ reads the first variable in the file.
 The function returns 0 on success, or -1 on failure.
 .Sh EXAMPLES
 The following example shows a list of variables in the MAT file, and prompts the
-user for the index of the variale to read. If the index is valid, the file is
+user for the index of the variable to read. If the index is valid, the file is
 reset to the beginning, and variables read until the selected index is reached.
 .Bd -literal
 #include <stdlib.h>

documentation/Mat_VarCreate.3

@@ -57,7 +57,7 @@ would use
 for the class type and
 .Dv MAT_T_DOUBLE
 for the data type. In some instances, the data type may not match the class
-type. For exmaple, an array of integers can be written in the double-precision
+type. For example, an array of integers can be written in the double-precision
 class by using
 .Dv MAT_T_INT32
 for

documentation/Mat_VarReadNextInfo.3

@@ -49,7 +49,8 @@ there was an error reading the variable, NULL is returned.
 This example program opens a MAT file named by the first argument to the
 program, and uses
 .Fn Mat_VarReadNextInfo
-to read the information about each variable in the file. For each variable read,the name, size, and class are printed in a format similar to the MATLAB whos
+to read the information about each variable in the file. For each variable read,
+the name, size, and class are printed in a format similar to the MATLAB whos
 command.
 .Bd -literal
 #include <stdlib.h>