fix typos

Author: coke

doc/Language/variables.pod6

@@ -875,7 +875,7 @@ re-applied by assigning C<Nil> to it:
 
 =head2 Default Defined Variables Pragma
 
-To force all variables to have a definedness contraint use the prama C<use
+To force all variables to have a definedness constraint use the prama C<use
 variables :D>. The pragma is lexically scoped and can be switched of with C<use
 variables :_>.
 
@@ -889,7 +889,7 @@ my Int $i = 1; # that works
 
 Please note that assigning L<Nil|/type/Nil> will revert the variable to it's
 default value. The default value of a defined constraint type is the type
-appended with C<:D> (e.g. C<Int:D>). That means a definedness contraint is no
+appended with C<:D> (e.g. C<Int:D>). That means a definedness constraint is no
 guarantee of definedness. This only applies to variable initializers, not to
 L<Signature|/type/Signature>s. or subsequent assignments to a variable.
 

doc/Type/Exception.pod6

@@ -34,7 +34,7 @@ return the exception message.
 Special care should be taken that this method does not produce
 an exception itself.
 
-    try die "Something bad happend";
+    try die "Something bad happened";
     if ($!) {
         say $!.message; # Something bad happened.
     }
@@ -48,7 +48,7 @@ Defined as:
 Returns the backtrace associated with the exception. Only makes sense
 on exceptions that have been thrown at least once.
 
-    try die "Something bad happend";
+    try die "Something bad happened";
     if ($!) {
         say $!.backtrace;
     }

doc/Type/Hash.pod6

@@ -149,9 +149,9 @@ Note that with objects as keys, you cannot access non-string keys as strings:
     :{ -1 => 41, 0 => 42, 1 => 43 }<0>;  # Any
     :{ -1 => 41, 0 => 42, 1 => 43 }{0};  # 42
 
-=head2 Contraint value types
+=head2 Constraint value types
 
-Place a type object inbetween the declarator and the name to contraint the type
+Place a type object in-between the declarator and the name to constraint the type
 of all values of a C<Hash>. Use a L<subset|/language/typesystem#subset> for
 constraints with a where-clause.
 

doc/Type/IO/Handle.pod6

@@ -69,7 +69,7 @@ on strings.
 
 =for code :skip-test
 my $fh = open 'path/to/file', :r;
-$fn.split(' ', close => True); # Returns file content splitted by a space and closes file;
+$fn.split(' ', close => True); # Returns file content split by a space and closes file;
 
 =head2 method comb
 

doc/Type/Nil.pod6

@@ -65,7 +65,7 @@ type container will fail with a runtime error.
     $x.say;                     # (Int)
 
     sub f( --> Int:D ){ Nil }; # this definedness constraint is ignored
-    my Int:D $i = f; # this definedness contraint is not ignored, so throws
+    my Int:D $i = f; # this definedness constraint is not ignored, so throws
     CATCH { default { put .^name, ': ', .Str } };
     # OUTPUT: «X::TypeCheck::Assignment: Type check failed in assignment to $y; expected Int but got Any (Any)»