ICU-20438 Updating index page of C docs with new APIs and fixing links.

Author: sffc

icu4c/source/common/unicode/docmain.h

@@ -33,7 +33,7 @@
  * then detailed member descriptions.</p>
  * 
  * <h3>C Programmers:</h3>
- * <p>Use <a href="#Module">Module List</a> or <a href="globals.html">File Members</a>
+ * <p>Use <a href="#Module">Module List</a> or <a href="globals_u.html">File Members</a>
  * to find a list of all the functions and constants.
  * For example, to find BreakIterator functions you would click on
  * <a href="files.html"> File List</a>,
@@ -115,7 +115,7 @@
  *   <tr>
  *     <td>Locales </td>
  *     <td>uloc.h</a></td>
- *     <td>icu::Locale</td>
+ *     <td>icu::Locale, icu::LocaleBuilder</td>
  *   </tr>
  *   <tr>
  *     <td>Resource Bundles</td>
@@ -143,11 +143,16 @@
  *     <td>icu::MessageFormat</td>
  *   </tr>
  *   <tr>
- *     <td>Number Formatting</td>
+ *     <td>Number Formatting<br/>(includes currency and unit formatting)</td>
  *     <td>unumberformatter.h, unum.h</td>
  *     <td>icu::number::NumberFormatter (ICU 60+) or icu::NumberFormat (older versions)</td>
  *   </tr>
  *   <tr>
+ *     <td>Number Range Formatting<br />(includes currency and unit ranges)</td>
+ *     <td>(no C API)</td>
+ *     <td>icu::number::NumberRangeFormatter</td>
+ *   </tr>
+ *   <tr>
  *     <td>Number Spellout<br/>(Rule Based Number Formatting)</td>
  *     <td>unum.h<br/>(use UNUM_SPELLOUT)</td>
  *     <td>icu::RuleBasedNumberFormat</td>