Fix minor typos (#76)

Author: joshmoore

salad/schema_salad/metaschema/field_name.yml

@@ -9,7 +9,7 @@
   which are not part of the vocabulary are resolved using the following
   rules:
 
-  * If an field name URI begins with a namespace prefix declared in the
+  * If a field name URI begins with a namespace prefix declared in the
   document context (`@context`) followed by a colon `:`, the prefix and
   colon must be replaced by the namespace declared in `@context`.
 

salad/schema_salad/metaschema/ident_res.yml

@@ -9,7 +9,7 @@
       fragment identifier.  It is resolved relative to the base URI by
       setting or replacing the fragment portion of the base URI.
 
-    * If an identifier URI contains `#` in some other position is a
+    * If an identifier URI contains `#` in some other position it is a
       relative URI with fragment identifier.  It is resolved relative
       to the base URI by stripping the last path segment from the base
       URI and adding the identifier followed by the fragment.

salad/schema_salad/metaschema/import_include.md

@@ -28,20 +28,20 @@ or resource fragment which does not exist or is not accessible.
 
 ### Import example
 
-import.yml:
+import.json:
 ```
 {
   "hello": "world"
 }
 
 ```
 
-parent.yml:
+parent.json:
 ```
 {
   "form": {
     "bar": {
-      "$import": "import.yml"
+      "$import": "import.json"
       }
   }
 }
@@ -83,7 +83,7 @@ which does not exist or is not accessible.
 
 ### Include example
 
-parent.yml:
+parent.json:
 ```
 {
   "form": {

salad/schema_salad/metaschema/link_res.yml

@@ -1,7 +1,7 @@
 - |
   ## Link resolution
 
-  The schema may designate one or more fields as link fields reference other
+  The schema may designate one or more fields as link fields that reference other
   objects.  Processing must resolve links to either absolute URIs using the
   following rules:
 

salad/schema_salad/metaschema/map_res.yml

@@ -4,7 +4,7 @@
   The schema may designate certain fields as having a `mapSubject`.  If the
   value of the field is a JSON object, it must be transformed into an array of
   JSON objects.  Each key-value pair from the source JSON object is a list
-  item, each list item must be a JSON objects, and the value of the key is
+  item, each list item must be a JSON object, and the value of the key is
   assigned to the field specified by `mapSubject`.
 
   Fields which have `mapSubject` specified may also supply a `mapPredicate`.

salad/schema_salad/metaschema/salad.md

@@ -247,7 +247,7 @@ rules:
   * If the value of `jsonldPredicate` is `@id`, the field is an identifier
   field.
 
-  * If the value of `jsonldPredicate` is an object, and contains that
+  * If the value of `jsonldPredicate` is an object, and that
   object contains the field `_type` with the value `@id`, the field is a
   link field subject to [link validation](#Link_validation).