add 'Characters' tag and bold terms

Author: Dusch4593

content/java/concepts/output/output.md

@@ -4,6 +4,7 @@ Description: 'The System.out stream allows a Java program to output characters t
 Subjects:
   - 'Computer Science'
 Tags:
+  - 'Characters'
   - 'Output'
   - 'Strings'
   - 'Print'
@@ -12,4 +13,4 @@ CatalogContent:
   - 'paths/computer-science'
 ---
 
-The `System.out` stream allows a Java program to output characters to the console. It has several methods that allow printing output. Some of the significant ones are listed below.
+The **`System.out`** stream allows a Java program to output characters to the console. It has several methods that allow printing output. Some of the significant ones are listed below.

content/java/concepts/output/terms/print/print.md

@@ -4,6 +4,7 @@ Description: 'Prints its argument to the console.'
 Subjects:
   - 'Computer Science'
 Tags:
+  - 'Characters'
   - 'Output'
   - 'Strings'
   - 'Print'
@@ -12,7 +13,7 @@ CatalogContent:
   - 'paths/computer-science'
 ---
 
-The `.print()` method prints its argument to the console. Unlike the similar [`.println()`](https://www.codecademy.com/resources/docs/java/output/println) method, `.print()` does not follow its argument with a new line, and any subsequent characters sent to the console will begin wherever the prior `.print()` command left off.
+The **`.print()`** method prints its argument to the console. Unlike the similar [`.println()`](https://www.codecademy.com/resources/docs/java/output/println) method, `.print()` does not follow its argument with a new line, and any subsequent characters sent to the console will begin wherever the prior `.print()` command left off.
 
 ## Syntax
 

content/java/concepts/output/terms/printf/printf.md

@@ -4,6 +4,7 @@ Description: 'Prints output to the console using various formatting commands.'
 Subjects:
   - 'Computer Science'
 Tags:
+  - 'Characters'
   - 'Output'
   - 'Strings'
   - 'Print'
@@ -12,7 +13,7 @@ CatalogContent:
   - 'paths/computer-science'
 ---
 
-The `.printf()` method prints output to the console with the use of various formatting commands.
+The **`.printf()`** method prints output to the console with the use of various formatting commands.
 
 ## Syntax
 

content/java/concepts/output/terms/println/println.md

@@ -4,6 +4,7 @@ Description: 'Prints its argument to the console followed by a new line.'
 Subjects:
   - 'Computer Science'
 Tags:
+  - 'Characters'
   - 'Output'
   - 'Strings'
   - 'Print'
@@ -12,7 +13,7 @@ CatalogContent:
   - 'paths/computer-science'
 ---
 
-The `.println()` method prints its argument to the console follwed by a new line. It is probably the most common method of displaying output to the console.
+The **`.println()`** method prints its argument to the console follwed by a new line. It is probably the most common method of displaying output to the console.
 
 ## Syntax