doc: Fix requirements to build documentation

Use strict Python packages version in requirements

Signed-off-by: Tomasz Tyzenhauz <[email protected]>

doc/requirements-doc.txt

@@ -11,12 +11,12 @@ sphinx-tabs==3.1.0
 sphinx-togglebutton==0.3.2
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-htmlhelp>=2.0.0
+sphinxcontrib-htmlhelp==2.0.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-mscgen==0.6
 sphinxcontrib-plantuml==0.21
 sphinxcontrib-qthelp==1.0.3
-sphinxcontrib-serializinghtml>=1.1.5
+sphinxcontrib-serializinghtml==1.1.5
 sphinxcontrib-svg2pdfconverter==1.1.1
 sphinxcontrib-websupport==1.2.2
 sphinx-markdown-builder==0.5.5