Docs: Fix links to Platforms page on build encyclopedia

PiperOrigin-RevId: 364885937

src/main/java/com/google/devtools/build/lib/rules/platform/ConstraintSettingRule.java

@@ -60,9 +60,10 @@ public RuleDefinition.Metadata getMetadata() {
 
 <p>This rule is used to introduce a new constraint type for which a platform may specify a value.
 For instance, you might define a <code>constraint_setting</code> named "glibc_version" to represent
-the capability for platforms to have different versions of the glibc library installed. See the
-<a href="https://docs.bazel.build/versions/master/platforms.html">Platforms</a> page for more
-details.
+the capability for platforms to have different versions of the glibc library installed.
+
+For more details, see the
+<a href="https://docs.bazel.build/versions/master/platforms.html">Platforms</a> page.
 
 <p>Each <code>constraint_setting</code> has an extensible set of associated
 <code>constraint_value</code>s. Usually these are defined in the same package, but sometimes a

src/main/java/com/google/devtools/build/lib/rules/platform/ConstraintValueRule.java

@@ -57,9 +57,10 @@ public Metadata getMetadata() {
 }
 /*<!-- #BLAZE_RULE (NAME = constraint_value, FAMILY = Platform)[GENERIC_RULE] -->
 
-This rule introduces a new value for a given constraint type. See the
-<a href="https://docs.bazel.build/versions/master/platforms.html">Platforms</a> page for more
-details.
+This rule introduces a new value for a given constraint type.
+
+For more details, see the
+<a href="https://docs.bazel.build/versions/master/platforms.html">Platforms</a> page.
 
 <h4 id="constraint_value_examples">Example</h4>
 <p>The following creates a new possible value for the predefined <code>constraint_value</code>

src/main/java/com/google/devtools/build/lib/rules/platform/PlatformRule.java

@@ -134,10 +134,12 @@ public Metadata getMetadata() {
 }
 /*<!-- #BLAZE_RULE (NAME = platform, FAMILY = Platform)[GENERIC_RULE] -->
 
-<p>This rule defines a new platform -- a named collection of constraint choices (such as cpu
-architecture or compiler version) describing an environment in which part of the build may run.
-See the <a href="../platforms.html">Platforms</a> page for
-more details.
+<p>This rule defines a new platform -- a named collection of constraint choices
+(such as cpu architecture or compiler version) describing an environment in
+which part of the build may run.
+
+For more details, see the
+<a href="https://docs.bazel.build/versions/master/platforms.html">Platforms</a> page.
 
 <h4 id="platform_examples">Example</h4>
 <p>