[ci skip] minor: fix indentation in manual.rst

(cherry picked from commit d3529d0)

doc/manual.rst

@@ -5759,12 +5759,12 @@ avoid ambiguity when there are multiple modules with the same path.
 There are two pseudo directories:
 
 1. ``std``: The ``std`` pseudo directory is the abstract location of Nim's standard
-library. For example, the syntax ``import std / strutils`` is used to unambiguously
-refer to the standard library's ``strutils`` module.
+   library. For example, the syntax ``import std / strutils`` is used to unambiguously
+   refer to the standard library's ``strutils`` module.
 2. ``pkg``: The ``pkg`` pseudo directory is used to unambiguously refer to a Nimble
-package. However, for technical details that lie outside of the scope of this document
-its semantics are: *Use the search path to look for module name but ignore the standard
-library locations*. In other words, it is the opposite of ``std``.
+   package. However, for technical details that lie outside of the scope of this document
+   its semantics are: *Use the search path to look for module name but ignore the standard
+   library locations*. In other words, it is the opposite of ``std``.
 
 
 From import statement