fix docstring url for schema in vulnerability module

found few classes having incorrect url in vulnerability module while
going through them

Signed-off-by: Indivar Mishra <indimishra@gmail.com>

Author: indiVar0508

cyclonedx/model/vulnerability.py

@@ -62,7 +62,7 @@ class BomTargetVersionRange:
     `version` and `version_range` are mutually exclusive.
 
     .. note::
-        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/#type_vulnerabilityType
+        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/xml/#type_vulnerabilityType
     """
 
     def __init__(
@@ -219,7 +219,7 @@ class VulnerabilityAnalysis:
     Class that models the `analysis` sub-element of the `vulnerabilityType` complex type.
 
     .. note::
-        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/#type_vulnerabilityType
+        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/xml/#type_vulnerabilityType
     """
 
     def __init__(
@@ -403,7 +403,7 @@ class VulnerabilitySource:
     This type is used for multiple purposes in the CycloneDX schema.
 
     .. note::
-        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/#type_vulnerabilitySourceType
+        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/xml/#type_vulnerabilitySourceType
     """
 
     def __init__(
@@ -471,7 +471,7 @@ class VulnerabilityReference:
     intelligence.
 
     .. note::
-        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/#type_vulnerabilityType
+        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/xml/#type_vulnerabilityType
     """
 
     def __init__(
@@ -714,7 +714,7 @@ class VulnerabilityRating:
     1.4 - see https://github.com/CycloneDX/specification/blob/master/schema/ext/vulnerability-1.0.xsd.
 
     .. note::
-        See `ratingType` in https://cyclonedx.org/docs/1.6/#ratingType
+        See `ratingType` in https://cyclonedx.org/docs/1.6/xml/#ratingType
 
     .. warning::
         As part of implementing support for CycloneDX schema version 1.4, the three score types defined in the schema
@@ -847,7 +847,7 @@ class VulnerabilityCredits:
     extension (in XML only).
 
     .. note::
-        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/#type_vulnerabilityType
+        See the CycloneDX schema: https://cyclonedx.org/docs/1.6/xml/#type_vulnerabilityType
     """
 
     def __init__(