docs: fix various paragraph issues in javadoc (#867)

Author: Anusien

google-http-client/src/main/java/com/google/api/client/http/AbstractInputStreamContent.java

@@ -29,8 +29,6 @@
  * amount of content read from the input stream, you may use {@link ByteStreams#limit(InputStream,
  * long)}.
  *
- * <p>
- *
  * <p>Implementations don't need to be thread-safe.
  *
  * @since 1.4

google-http-client/src/main/java/com/google/api/client/http/ExponentialBackOffPolicy.java

@@ -31,7 +31,7 @@
  *     retry_interval * (random value in range [1 - randomization_factor, 1 + randomization_factor])
  * </pre>
  *
- * In other words {@link #getNextBackOffMillis()} will range between the randomization factor
+ * <p>In other words {@link #getNextBackOffMillis()} will range between the randomization factor
  * percentage below and above the retry interval. For example, using 2 seconds as the base retry
  * interval and 0.5 as the randomization factor, the actual back off period used in the next retry
  * attempt will be between 1 and 3 seconds.

google-http-client/src/main/java/com/google/api/client/json/JsonParser.java

@@ -50,8 +50,6 @@
  * <p>Implementation has no fields and therefore thread-safe, but sub-classes are not necessarily
  * thread-safe.
  *
- * <p>
- *
  * <p>If a JSON map is encountered while using a destination class of type Map, then an {@link
  * java.util.ArrayMap} is used by default for the parsed values.
  *

google-http-client/src/main/java/com/google/api/client/json/JsonString.java

@@ -32,15 +32,15 @@
  * </code>
  * </pre>
  *
- * can be used for this JSON content:
+ * <p>can be used for this JSON content:
  *
  * <pre>
  * <code>
  * {"value" : 12345768901234576890123457689012345768901234576890}
  * </code>
  * </pre>
  *
- * However, if instead the JSON content uses a JSON String to store the value, one needs to use the
+ * <p>However, if instead the JSON content uses a JSON String to store the value, one needs to use the
  * {@link JsonString} annotation. For example:
  *
  * <pre>
@@ -51,7 +51,7 @@
  * </code>
  * </pre>
  *
- * can be used for this JSON content:
+ * <p>can be used for this JSON content:
  *
  * <pre>
  * <code>

google-http-client/src/main/java/com/google/api/client/testing/json/webtoken/TestCertificates.java

@@ -240,7 +240,7 @@ public X509TrustManager getTrustManager() throws IOException, GeneralSecurityExc
    * {"foo":"bar"}
    * </pre>
    *
-   * The message is signed using {@code FOO_BAR_COM_KEY}.
+   * <p>The message is signed using {@code FOO_BAR_COM_KEY}.
    */
   public static final String JWS_SIGNATURE =
       "eyJhbGciOiJSUzI1NiIsIng1YyI6WyJNSUlDNlRDQ0FkRUNBU293RFFZSktvWklo"

google-http-client/src/main/java/com/google/api/client/util/PemReader.java

@@ -36,9 +36,7 @@
  *
  * <p>Limitations:
  *
- * <p>
- *
- * <ul>
+ * <p><ul>
  *   <li>Assumes the PEM file section content is not encrypted and cannot handle the case of any
  *       headers inside the BEGIN and END tag.
  *   <li>It also ignores any attributes associated with any PEM file section.