Fix typos in xsd documentation (#200)

Signed-off-by: Dan Rose <[email protected]>

Author: rotu

xsd/package_common.xsd

@@ -15,7 +15,7 @@
   <xs:complexType name="DescriptionType" mixed="true">
     <xs:annotation>
       <xs:documentation>
-        The description allows any content but should be limit to XHTML.
+        The description allows any content but should be limited to XHTML.
       </xs:documentation>
     </xs:annotation>
     <xs:sequence>
@@ -28,7 +28,7 @@
       <xs:documentation>
         A valid email address must follow several complex rules
         (see https://en.wikipedia.org/wiki/Email_address).
-        For ROS packages only a few are enforced and not the full character set
+        For ROS packages only a few are enforced, and not the full character set
         is supported.
       </xs:documentation>
     </xs:annotation>

xsd/package_format1.xsd

@@ -5,15 +5,15 @@
   <xs:complexType name="DependencyType">
     <xs:simpleContent>
       <xs:extension base="xs:token">
-        <!-- The dependency must have a version less then the specified limit. -->
+        <!-- The dependency must have a version less than the specified limit. -->
         <xs:attribute name="version_lt" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version less then or equal to the specified limit. -->
+        <!-- The dependency must have a version less than or equal to the specified limit. -->
         <xs:attribute name="version_lte" type="VersionLimitType" use="optional"/>
         <!-- The dependency must have a version equal to the specified limit. -->
         <xs:attribute name="version_eq" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then or equal to the specified limit. -->
+        <!-- The dependency must have a version greater than or equal to the specified limit. -->
         <xs:attribute name="version_gte" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then the specified limit. -->
+        <!-- The dependency must have a version greater than the specified limit. -->
         <xs:attribute name="version_gt" type="VersionLimitType" use="optional"/>
       </xs:extension>
     </xs:simpleContent>

xsd/package_format2.xsd

@@ -5,15 +5,15 @@
   <xs:complexType name="DependencyType">
     <xs:simpleContent>
       <xs:extension base="xs:token">
-        <!-- The dependency must have a version less then the specified limit. -->
+        <!-- The dependency must have a version less than the specified limit. -->
         <xs:attribute name="version_lt" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version less then or equal to the specified limit. -->
+        <!-- The dependency must have a version less than or equal to the specified limit. -->
         <xs:attribute name="version_lte" type="VersionLimitType" use="optional"/>
         <!-- The dependency must have a version equal to the specified limit. -->
         <xs:attribute name="version_eq" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then or equal to the specified limit. -->
+        <!-- The dependency must have a version greater than or equal to the specified limit. -->
         <xs:attribute name="version_gte" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then the specified limit. -->
+        <!-- The dependency must have a version greater than the specified limit. -->
         <xs:attribute name="version_gt" type="VersionLimitType" use="optional"/>
       </xs:extension>
     </xs:simpleContent>

xsd/package_format3.xsd

@@ -19,15 +19,15 @@
   <xs:complexType name="DependencyType">
     <xs:simpleContent>
       <xs:extension base="xs:token">
-        <!-- The dependency must have a version less then the specified limit. -->
+        <!-- The dependency must have a version less than the specified limit. -->
         <xs:attribute name="version_lt" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version less then or equal to the specified limit. -->
+        <!-- The dependency must have a version less than or equal to the specified limit. -->
         <xs:attribute name="version_lte" type="VersionLimitType" use="optional"/>
         <!-- The dependency must have a version equal to the specified limit. -->
         <xs:attribute name="version_eq" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then or equal to the specified limit. -->
+        <!-- The dependency must have a version greater than or equal to the specified limit. -->
         <xs:attribute name="version_gte" type="VersionLimitType" use="optional"/>
-        <!-- The dependency must have a version greater then the specified limit. -->
+        <!-- The dependency must have a version greater than the specified limit. -->
         <xs:attribute name="version_gt" type="VersionLimitType" use="optional"/>
         <xs:attribute name="condition" use="optional">
           <xs:simpleType>