Consistently mention language in metric names

This improves consistency between the lines of code queries and the
number of successfully extracted files queries.

Author: henrymercer

csharp/ql/src/Metrics/Summaries/LinesOfCode.ql

@@ -1,6 +1,6 @@
 /**
  * @id cs/summary/lines-of-code
- * @name Total lines of code in the database
+ * @name Total lines of C# code in the database
  * @description The total number of lines of code across all files. This is a useful metric of the size of a database. For all files that were seen during the build, this query counts the lines of code, excluding whitespace or comments.
  * @kind metric
  * @tags summary

java/ql/src/Metrics/Summaries/LinesOfCode.ql

@@ -1,6 +1,6 @@
 /**
  * @id java/summary/lines-of-code
- * @name Total lines of code in the database
+ * @name Total lines of Java code in the database
  * @description The total number of lines of code across all files. This is a useful metric of the size of a database.
  *              For all files that were seen during the build, this query counts the lines of code, excluding whitespace
  *              or comments.

ql/ql/src/queries/summary/NumberOfFilesExtractedWithErrors.ql

@@ -1,6 +1,6 @@
 /**
  * @id ql/summary/number-of-files-extracted-with-errors
- * @name Total number of files that were extracted with errors
+ * @name Total number of QL files that were extracted with errors
  * @description The total number of QL code files that we extracted, but where
  *  at least one extraction error occurred in the process.
  * @kind metric

ql/ql/src/queries/summary/NumberOfSuccessfullyExtractedFiles.ql

@@ -1,6 +1,6 @@
 /**
  * @id ql/summary/number-of-successfully-extracted-files
- * @name Total number of files that were extracted without error
+ * @name Total number of QL files that were extracted without error
  * @description The total number of QL code files that we extracted without
  *   encountering any extraction errors
  * @kind metric

ruby/ql/src/queries/summary/NumberOfFilesExtractedWithErrors.ql

@@ -1,6 +1,6 @@
 /**
  * @id rb/summary/number-of-files-extracted-with-errors
- * @name Total number of files that were extracted with errors
+ * @name Total number of Ruby files that were extracted with errors
  * @description The total number of Ruby code files that we extracted, but where
  *  at least one extraction error occurred in the process.
  * @kind metric

ruby/ql/src/queries/summary/NumberOfSuccessfullyExtractedFiles.ql

@@ -1,6 +1,6 @@
 /**
  * @id rb/summary/number-of-successfully-extracted-files
- * @name Total number of files that were extracted without error
+ * @name Total number of Ruby files that were extracted without error
  * @description The total number of Ruby code files that we extracted without
  *   encountering any extraction errors
  * @kind metric