add hard newlines to fix formatting in string.format (#5084)

Author: gewarren

xml/System/String.xml

@@ -5301,14 +5301,14 @@ Invalid sequences are represented in the enumeration by <xref:System.Text.Rune.R
 
  In this section:
 
- [Get started with the String.Format method](#Starting)
- [Which method do I call?](#FTaskList)
- [The Format method in brief](#Format_Brief)
- [The Format item](#FormatItem)
- [How arguments are formatted](#HowFormatted)
- [Format items that have the same index](#SameIndex)
- [Formatting and culture](#Format_Culture)
- [Custom formatting operations](#Format_Custom)
+ [Get started with the String.Format method](#Starting)\
+ [Which method do I call?](#FTaskList)\
+ [The Format method in brief](#Format_Brief)\
+ [The Format item](#FormatItem)\
+ [How arguments are formatted](#HowFormatted)\
+ [Format items that have the same index](#SameIndex)\
+ [Formatting and culture](#Format_Culture)\
+ [Custom formatting operations](#Format_Custom)\
  [String.Format Q & A](#QA)
 
 <a name="Starting"></a>
@@ -5410,15 +5410,15 @@ Invalid sequences are represented in the enumeration by <xref:System.Text.Rune.R
 
  A format item has the following elements:
 
- *index*
+ *index*\
  The zero-based index of the argument whose string representation is to be included at this position in the string. If this argument is `null`, an empty string will be included at this position in the string.
 
- *alignment*
+ *alignment*\
  Optional. A signed integer that indicates the total length of the field into which the argument is inserted and whether it is right-aligned (a positive integer) or left-aligned (a negative integer). If you omit *alignment*, the string representation of the corresponding argument is inserted in a field with no leading or trailing spaces.
 
  If the value of *alignment* is less than the length of the argument to be inserted, *alignment* is ignored and the length of the string representation of the argument is used as the field width.
 
- *formatString*
+ *formatString*\
  Optional. A string that specifies the format of the corresponding argument's result string. If you omit *formatString*, the corresponding argument's parameterless `ToString` method is called to produce its string representation. If you specify *formatString*, the argument referenced by the format item must implement the <xref:System.IFormattable> interface. Types that support format strings include:
 
 -   All integral and floating-point types. (See [Standard Numeric Format Strings](/dotnet/standard/base-types/standard-numeric-format-strings) and [Custom Numeric Format Strings](/dotnet/standard/base-types/custom-numeric-format-strings).)
@@ -5610,17 +5610,17 @@ The following are some of the examples included in the article:
 
 ### Create a format string
 
-[Inserting a string](#insert-a-string)
-[The format item](#the-format-item)
+[Inserting a string](#insert-a-string)\
+[The format item](#the-format-item)\
 [Format items that have the same index](#format-items-that-have-the-same-index)
 
 ### Control formatted output
 
-[Controlling formatting](#control-formatting)
-[Controlling spacing](#control-spacing)
-[Controlling alignment](#control-alignment)
-[Controlling the number of integral digits](#how-do-i-control-the-number-of-integral-digits)
-[Controlling the number of digits after the decimal separator](#how-do-i-control-the-number-of-digits-after-the-decimal-separator)
+[Controlling formatting](#control-formatting)\
+[Controlling spacing](#control-spacing)\
+[Controlling alignment](#control-alignment)\
+[Controlling the number of integral digits](#how-do-i-control-the-number-of-integral-digits)\
+[Controlling the number of digits after the decimal separator](#how-do-i-control-the-number-of-digits-after-the-decimal-separator)\
 [Including literal braces in a result string](#braces)
 
 ### Make format strings culture-sensitive
@@ -5629,7 +5629,7 @@ The following are some of the examples included in the article:
 
 ### Customize the formatting operation
 
-[A custom formatting operation](#example-a-custom-formatting-operation)
+[A custom formatting operation](#example-a-custom-formatting-operation)\
 [An intercept provider and Roman numeral formatter](#example-an-intercept-provider-and-roman-numeral-formatter)
 
  ]]></format>