docs: Remove the deleted function find_library

docs/markdown/Reference-manual.md

@@ -780,12 +780,6 @@ creating the final list.
 The returned object also has methods that are documented in the
 [object methods section](#build-target-object) below.
 
-### find_library()
-
-*(since 0.31.0)* **(deprecated)** Use `find_library()` method of
-[the compiler object](#compiler-object) as obtained from
-`meson.get_compiler(lang)`.
-
 ### find_program()
 
 ``` meson
@@ -2865,7 +2859,7 @@ env.prepend('MY_PATH', '0')
 
 ### `external library` object
 
-This object is returned by [`find_library()`](#find_library) and
+This object is returned by [`find_library()`](#compiler-object) and
 contains an external (i.e. not built as part of this project)
 library. This object has the following methods:
 

docs/markdown/Vala.md

@@ -38,7 +38,7 @@ map Vala code to the library's C programming interface. It is the
 [`pkg-config`](https://www.freedesktop.org/wiki/Software/pkg-config/)
 tool that makes finding these installed files all work seamlessly
 behind the scenes. When a `pkg-config` file doesn't exist for the
-library then the [`find_library()`](Reference-manual.md#find_library)
+library then the `find_library()`
 method of the [compiler object](Reference-manual.md#compiler-object)
 needs to be used. Examples are given later.
 

docs/markdown/howtox.md

@@ -85,7 +85,7 @@ executable(..., override_options : ['c_std=c11'])
 
 ## Enable threads
 
-Lots of people seem to do this manually with `find_library('pthread')`
+Lots of people seem to do this manually with `cc.find_library('pthread')`
 or something similar. Do not do that. It is not portable. Instead do
 this.