Fix broken links in documents (#5473)

Fix broken links in doc/epub.md, doc/getting-started.md,
doc/customizing-pandoc.md, doc/using-the-pandoc-api.md.
Also, use absolute links to pandoc.org when possible, so that
the links can be followed by people viewing these documents
on GitHub.

1 files changed, 13 insertions, 13 deletions

diff --git a/doc/customizing-pandoc.md b/doc/customizing-pandoc.md
index 62094e5ce..cba38b2c6 100644
--- a/doc/customizing-pandoc.md
+++ b/doc/customizing-pandoc.md
@@ -46,14 +46,14 @@ There are several ways to set template variables:
 | accessible by filters: | no        | yes               | yes                         |
 
 
-[`--variable`]:      http://pandoc.org/MANUAL.html#option--variable
-[`--metadata`]:      http://pandoc.org/MANUAL.html#option--metadata
-[YAML metadata]:     http://pandoc.org/MANUAL.html#extension-yaml_metadata_block
-[`--metadata-file`]: http://pandoc.org/MANUAL.html#option--metadata-file
+[`--variable`]:      https://pandoc.org/MANUAL.html#option--variable
+[`--metadata`]:      https://pandoc.org/MANUAL.html#option--metadata
+[YAML metadata]:     https://pandoc.org/MANUAL.html#extension-yaml_metadata_block
+[`--metadata-file`]: https://pandoc.org/MANUAL.html#option--metadata-file
 
 
 
-For more information, see [Templates](/MANUAL.html#templates) in
+For more information, see [Templates](https://pandoc.org/MANUAL.html#templates) in
 the pandoc manual.
 
 ### Example: adding structured author data to HTML
@@ -73,7 +73,7 @@ For `docx`, `pptx` or `odt` documents, things are a bit more
 complicated. Instead of a single template file, you need to
 provide a customized `reference.docx/pptx/odt`.
 See the manual for the
-[`--reference-doc`](/MANUAL.html#option--reference-doc) option.
+[`--reference-doc`](https://pandoc.org/MANUAL.html#option--reference-doc) option.
 
 ### Example: changing the font and line spacing in a Word docx
 
@@ -111,9 +111,9 @@ use an interface built directly into pandoc, and must be written
 in the Lua language).  If you are writing your own filters, it
 is best to use Lua filters, which are more portable (they
 require only pandoc itself) and more efficient.  See [Lua
-filters](lua-filters.html) for documentation and examples.  If
+filters](https://pandoc.org/lua-filters.html) for documentation and examples.  If
 you would prefer to write your filter in another language, see
-[Filters](filters.html) for a gentle introduction to JSON
+[Filters](https://pandoc.org/filters.html) for a gentle introduction to JSON
 filters.
 
 There's a repository of lua filters at
@@ -136,7 +136,7 @@ TODO
 ## Generic Divs and Spans
 
 TODO
-[Divs and Spans](/MANUAL.html#divs-and-spans): generic blocks
+[Divs and Spans](https://pandoc.org/MANUAL.html#divs-and-spans): generic blocks
 that can be transformed with filters
 
 ### Example: colored text
@@ -144,23 +144,23 @@ that can be transformed with filters
 
 ### Example: custom styles in docx
 
-[Custom Styles in Docx](/MANUAL.html#custom-styles-in-docx)
+[Custom Styles in Docx](https://pandoc.org/MANUAL.html#custom-styles-in-docx)
 
 ## Raw attributes
 
 TODO
-[Generic raw attributes](/MANUAL.html#generic-raw-attribute):
+[Generic raw attributes](https://pandoc.org/MANUAL.html#generic-raw-attribute):
 to include raw snippets
 
 ## Custom writers
 
 TODO
-[Custom writers](/MANUAL.html#custom-writers)
+[Custom writers](https://pandoc.org/MANUAL.html#custom-writers)
 
 ## Custom syntax highlighting
 
 TODO
-[Custom syntax highlighting](/MANUAL.html#syntax-highlighting),
+[Custom syntax highlighting](https://pandoc.org/MANUAL.html#syntax-highlighting),
 provided by the [skylighting
 library](https://github.com/jgm/skylighting)